Most of us have prayed something like this at least once. God, if you’re really there, do this one thing and I will believe you.
Perhaps it was whispered in a hospital corridor, or thrown at the ceiling at 2 in the morning. It felt like faith. But the Bible has a different name for it. It calls it testing God, and it forbids it plainly: You shall not put the LORD your God to the test (Deuteronomy 6:16).
That command creates an immediate puzzle. The same Bible tells us to test everything (1 Thessalonians 5:21) and to test the spirits to see whether they are from God (1 John 4:1). So which is it? Are we to test, or not?
Everything depends on one question: who is standing in the dock? We’re told to test every claim, every teacher and every spirit. We’re forbidden to test the One by whom all claims are measured. To test God is to reverse the courtroom—to climb into the judge’s seat and require the Almighty to produce evidence before we will trust Him. The whole subject turns on that reversal.
Two Kinds of Testing
The confusion disappears once we look at the words.
The Old Testament uses the Hebrew verb nasah, meaning to test or to try. It runs both ways: God tests Abraham (Genesis 22:1), and Israel tests God (Exodus 17:2). The word itself is neutral; everything depends on who is doing it to whom.
The New Testament uses two different Greek verbs, and the difference between them unlocks everything.
Peirazo (and its stronger form ekpeirazo) means to put someone to the proof, provoking them to see what they will do. It’s the word Jesus uses when He refuses Satan in the wilderness: You shall not put the Lord your God to the test (Matthew 4:7).
Dokimazo means to test in order to approve, as a refiner tests metal to see whether it’s genuine. It’s the word behind test everything; hold fast what is good.
The difference isn’t in how searching the examination is, but in the direction of authority.
| TESTING SCRIPTURE COMMANDS | TESTING SCRIPTURE FORBIDS | |
|---|---|---|
| Greek word | dokimazo | peirazo / ekpeirazo |
| Who is examined | Claims, teachers, spirits, ourselves | God himself |
| The measuring stick | God’s word | Our own conditions |
| The posture | Submission to the standard | Judgement over the standard |
| Example | The Bereans (Acts 17:11) | Massah (Exodus 17:2) |
James settles it from the other side: God cannot be tempted with evil, and He Himself tempts no one (James 1:13). God tests His people to prove and strengthen what He has given. We test God to verify and control what He has promised. One is a father refining a child; the other is a child demanding that his father prove he exists.
Massah: The Day Israel Put God on Trial
The clearest picture of this sin comes early, at a place named after the sin committed there.
Israel had come out of Egypt. They’d seen the plagues, walked through the sea on dry ground, and eaten bread that appeared each morning. Then they camped at Rephidim, and there was no water.
Therefore the people quarrelled with Moses and said, “Give us water to drink.” And Moses said to them, “Why do you quarrel with me? Why do you test the LORD?” (Exodus 17:2)
Moses names the sin before anything else happens, and at the end of the account the place is named after it. Massah means testing; Meribah means quarrelling. Then comes the sentence that defines the whole subject:
“Is the LORD among us or not?” (Exodus 17:7)
That is what testing God sounds like. It’s not a request but a verdict-question: I will decide whether you are present, and here are the terms on which you must prove it. Douglas Stuart notes in his study of Exodus that the real offence at Rephidim was never the thirst, but the conclusion the people had already drawn from it.
From this one episode we can draw a working definition:
TESTING: A WORKING DEFINITION
To test God is to demand that He prove Himself on our terms as the price of our trust.
Why It Was So Serious
Three details lift this above a story about thirsty people losing their temper.
- They were not short of evidence. Psalm 95 looks back at that day: when your fathers put me to the test and put me to the proof, though they had seen my work (Psalm 95:9). Testing God is never caused by a shortage of evidence. It is a condition of the heart, not a gap in information.
- The staff was a staff of judgement. God tells Moses to take the staff with which you struck the Nile (Exodus 17:5), the instrument of plague on Egypt. Israel deserved that staff. Instead God says something astonishing: Behold, I will stand before you there on the rock at Horeb, and you shall strike the rock. The accused steps into the place of the judged. The blow falls on the rock, and water comes out.
- The rock wasn’t just a rock. Writing about this very journey, Paul says: and the Rock was Christ (1 Corinthians 10:4). Hold that thought; we shall return to it at the end.
Charles Hodge, commenting on Paul’s warning in that chapter, compresses the sin into a sentence: to try God is to put His patience, power or faithfulness to the proof, provoking Him to display what we’ve refused to believe.
It’s also rarely a single moment. God says the wilderness generation have put me to the test these ten times and have not obeyed my voice (Numbers 14:22). Testing God is a habit before it is an event.
The Command and the True Israel
40 years later Moses turns the incident into law: You shall not put the LORD your God to the test, as you tested him at Massah (Deuteronomy 6:16).
Centuries later a man stands in another wilderness, hungry and alone, and is invited to break that law—by means of a Bible verse.
Satan sets Jesus on the highest point of the temple and says: If you are the Son of God, throw yourself down. Then he quotes Psalm 91: He will command his angels concerning you (Matthew 4:6). That’s a real promise, genuinely in the book. Satan is not asking Jesus to doubt God’s word; he is asking Him to prove it.
Notice carefully what’s happening, because it’s the point most easily missed in the whole subject:
Presumption does not arrive dressed as unbelief. It arrives dressed as faith, and it comes with a Bible verse.
The suggestion sounds spiritual. Trust the promise. Take God at His word. Jump. Jesus answers with one line from Deuteronomy: Again it is written, “You shall not put the Lord your God to the test” (Matthew 4:7). RC Sproul often observed the devil is a competent theologian who quotes Scripture accurately and applies it wickedly.
From that refusal comes the sharpest distinction available to us:
Faith trusts God’s word in the circumstances God ordains.
Presumption manufactures circumstances that oblige God to act, so that His word may be proved.
All three temptations are answered from Deuteronomy 6 to 8, the very chapters that interpret Israel’s failure in the desert. Israel was tested in the wilderness 40 years and collapsed. Christ is tested 40 days and stands. Where the first people put God on trial, He refuses to.
Seven Ways People Test God
Scripture doesn’t leave this as a vague idea. It gives it specific shapes.
- Demanding proof before trusting. The Massah pattern. Trust is made conditional on a sign delivered to schedule.
- Dictating the terms. Not asking God to act, but specifying how, when and by what means—and treating any other answer as no answer.
- Creating danger and requiring rescue. The temple pinnacle. Manufacturing a risk God never asked us to take, then demanding He rescue us.
- Contempt for what he has provided. We loathe this worthless food (Numbers 21:5). Paul points to that episode when he writes We must not put Christ to the test (1 Corinthians 10:9). Settled complaint about God’s provision is itself testing.
- Presuming on his patience. Peter tells Sapphira she has agreed to test the Spirit of the Lord (Acts 5:9). Sinning deliberately while counting on later mercy is an experiment run on God’s character. Paul calls it presuming on the riches of His kindness (Romans 2:4).
- Adding rules God never gave. At the Jerusalem council Peter asks: Why are you putting God to the test by placing a yoke on the neck of the disciples…? (Acts 15:10). Loading believers with requirements God hasn’t made is itself named as testing Him.
- Forgetting. They did not remember His power (Psalm 78:42). Spiritual amnesia is the soil in which every fresh demand grows. Whoever cannot recall past mercies will always need one more sign.
What Testing God Is Not
This is where sincere believers are wounded by a half-truth. On being told testing God is sin, they conclude every honest question is rebellion and bury the struggle instead of bringing it. Scripture doesn’t teach that.
- Lament isn’t testing. How long, O LORD? Will you forget me for ever? (Psalm 13:1). God gave those words to His people to pray. Habakkuk argues. Job demands a hearing. Lament speaks to God as God; testing puts Him in the dock. The difference isn’t the volume of the complaint but the posture underneath it.
- Asking isn’t testing. If any of you lacks wisdom, let him ask God (James 1:5). Abraham’s servant prays for very specific guidance at a well and is answered without rebuke (Genesis 24:12–14).
- Doubt carried to Christ isn’t testing. I believe; help my unbelief! (Mark 9:24). The father in that story isn’t corrected but helped. Thomas too is met in his doubt.
- Examining teaching is commanded. The Bereans examined the Scriptures daily to see if these things were so (Acts 17:11). Testing a preacher is obedience; testing God is not.
- Using ordinary means isn’t weak faith. The opposite is true. Despising the means God supplies while demanding a miracle instead is the sin of the temple pinnacle.
Two Times God Says “Test Me”
Two passages appear to cut against all this. Read properly, both confirm it.
Malachi 3:10. God says of the tithe: And thereby put me to the test, says the LORD of hosts, if I will not open the windows of heaven for you. This is the single explicit invitation in Scripture to test God, and notice what it isn’t. It’s God’s initiative, not a formula the worshipper invents, and it is attached to obedience already commanded, not to a bargain we propose. Its setting is a courtroom: Israel has accused God, saying It’s vain to serve God (Malachi 3:14), and God stakes His own faithfulness against the charge. Michael Horton has warned how readily the verse is converted into a spiritual investment scheme, which is close to the reverse of what Malachi is doing.
Isaiah 7:10–12. The mirror image. God commands King Ahaz to ask for a sign, and Ahaz refuses by quoting Deuteronomy 6:16: I will not put the LORD to the test. It sounds like humility. God treats it as wearying unbelief. Alec Motyer noted Ahaz had already fixed his policy and was using pious language to keep God out of the decision.
| AHAZ (ISAIAH 7) | ISRAEL (EXODUS 17) | |
|---|---|---|
| What God said | Ask me for a sign | Trust me; you have seen my power |
| What they did | Refused to ask | Demanded proof |
| How it sounded | Reverent | Reasonable |
| What it actually was | Unbelief | Unbelief |
The lesson is sharp. The sin isn’t in asking, nor in refraining. It’s refusing to submit to what God has actually said. Piety can be a costume for self-rule in either direction.
Why God Takes This So Seriously
It reverses the order of reality. To test God we must first assume a position above Him from which He can be assessed. This is the oldest sin there is: Did God actually say…? (Genesis 3:1), followed by the woman’s own inspection of the tree. Paul’s reply is blunt: But who are you, O man, to answer back to God? (Romans 9:20).
It calls God a liar. God bound Himself by an oath so we who have fled for refuge might have strong encouragement (Hebrews 6:18). To demand fresh proof is to declare that oath insufficient. John says it without softening: whoever does not believe God has made him a liar (1 John 5:10).
It hardens. Hebrews 3 applies Psalm 95 straight to the church: do not harden your hearts as in the rebellion, on the day of testing in the wilderness. John Owen, expounding that passage, argued unbelief is the great provoking sin, and that the hardness it breeds is both its punishment and its cause. The wilderness generation perished not for lack of evidence but for lack of faith, in sight of the land.
Testing God Today
The wilderness is far away. The sin is not.
- The prosperity “seed” offering, built on a misread Malachi 3:10, which treats God as a mechanism rather than a Father.
- Refusing medical treatment, or courting danger, to demonstrate faith.
- Reckless financial decisions relabelled as trust.
- Sinning now and banking on grace later: Are we to continue in sin that grace may abound? By no means! (Romans 6:1–2).
- Waiting for a feeling before obeying a clear command: I will forgive when I am ready.
- Putting out a fleece where Scripture already speaks plainly.
- The ultimatum prayer: God, if you are real, do this by Friday.
- Adding conditions to the gospel—the Acts 15 sin, alive in every generation.
Behind most of these lies a hunger for a sign, and the answer isn’t a scolding but a redirection. God has already given signs. He gave baptism and the Lord’s Supper—visible words, appointed by Him, needing no fleece and no deadline. He gave His Spirit, who bears witness with our spirit that we are children of God (Romans 8:16). Sinclair Ferguson has often pointed out assurance is won not by staring inward for evidence but by looking outward to Christ. We invent signs largely because we neglect the ones already given.
The Rock That Was Struck
Return to Rephidim. Israel put God on trial, and God didn’t defend Himself. He stood on the rock and let the staff of judgement fall there.
Centuries later a crowd on a hill outside Jerusalem ran the last great test. He trusts in God; let God deliver him now, if He desires Him (Matthew 27:43). It was the temple pinnacle again, almost word for word: prove it, come down, and we will believe. He didn’t come down. The rock was struck a second time, and out of it came a river for the very people who were mocking.
So the question first asked at Massah has its answer. Is the LORD among us or not? He is. His name is Immanuel, God with us, and He has already submitted to our testing once, finally and completely.
Those who have that answer need no other sign. They need only stop asking God to prove what He has already proved, and trust the One who stood on the rock and took the blow.
Tough Questions, Honest Answers
Was Gideon wrong to put out the fleece?
The account is more uncomfortable than the sermon illustrations usually admit. Gideon had already received a direct word from God and a visible sign at the altar, so the fleece wasn’t a search for guidance but a request for reassurance about guidance he had already been given. He knows this himself, which is why he pleads let not your anger burn against me (Judges 6:39). God condescends to his weakness, but Scripture records the condescension without commending the method. The lesson is not “do what Gideon did” but “look how patient God is with weak faith”. Where God has already spoken plainly in His word, a fleece adds nothing except a delay.
What’s the difference between God testing us and us testing God?
The words may nearly be the same but the direction of authority is opposite. God tests His people to prove and strengthen what He has already given them—Abraham on the mountain (Genesis 22:1), Israel in the desert that He might humble you, testing you to know what was in your heart (Deuteronomy 8:2). Such testing is the work of a Father training a child, and James adds God Himself cannot be tempted with evil and tempts no one (James 1:13). When we test God, we reverse the roles: the creature examines the Creator and makes trust conditional on the result. The first testing produces maturity; the second produces hardness.
Does “test everything” in 1 Thessalonians 5:21 contradict the command not to test God?
No, because the two verses use different verbs with different objects. Dokimazo in 1 Thessalonians 5:21 means to assess something against a standard in order to approve it, which is why the same word family appears in test the spirits (1 John 4:1) and in Paul’s call to examine ourselves (2 Corinthians 13:5). Peirazo in Matthew 4:7 means to put someone on trial to see what they will do. We are commanded to measure every prophecy, every teacher and every claim by God’s word; we are forbidden to put God’s word itself on the scales. The Bereans are praised for the first (Acts 17:11) and the wilderness generation condemned for the second (Psalm 95:9).
Is refusing medical treatment and trusting God for healing an act of faith or a test?
Scripture consistently distinguishes between means and mediators. God ordinarily works through ordinary means: Isaiah applies a poultice of figs to Hezekiah in the same chapter where God miraculously adds fifteen years to his life (2 Kings 20:7), Paul tells Timothy to use a little wine for his stomach (1 Timothy 5:23), and Luke, the writer of a Gospel, is called the beloved physician (Colossians 4:14). Refusing the means God has supplied in order to force him into an extraordinary display is the pattern of the temple pinnacle, not the pattern of faith. Real trust may certainly pray for healing without medicine when no medicine exists; it doesn’t create a crisis in order to test the promise. Believers may also, in wisdom, decline particular treatments—but that is a judgement about the treatment, not a demand made on God.
Zechariah and Mary both questioned the angel. Why was only one disciplined?
The difference lies in what each question is really asking. Zechariah says How shall I know this? (Luke 1:18)—he wants credentials, evidence that the message can be relied upon. Mary says How will this be? (Luke 1:34)—she accepts the message and asks how it will work. Faith is free to ask how; it does not demand proof of whether. That is why Zechariah is silenced and Mary is told the mechanism, and why she ends the conversation with let it be to me according to your word.
If a Christian tests God today, will he strike them down as he struck Ananias and Sapphira?
The judgement in Acts 5 belongs to the founding moment of the church, when God marked the seriousness of lying to the Spirit in a way that was visible to everyone. It is recorded as a warning, not established as a standing pattern, and Scripture nowhere promises that presumption will always meet an immediate visible penalty. But Hebrews insists the warning still stands, applying the wilderness rebellion directly to the church (Hebrews 3:7–4:13), and Paul says these things were written down for our instruction (1 Corinthians 10:11). The usual consequences today are quieter and more dangerous: a hardening heart, a barren spiritual life, and years spent circling the same desert. The remedy isn’t a fresh sign but repentance and a return to the word, the sacraments and the fellowship of God’s people.
Can an unbeliever “test” God by asking him to reveal himself?
There’s a real difference between a seeker who says God, if you are there, show me and an Israelite at Massah who says Is the LORD among us or not? after ten deliverances. God is remarkably generous to genuine seekers, and Scripture is full of people who came with confusion and were met—Nathanael’s scepticism, the Ethiopian official’s puzzlement, Thomas’s refusal to believe secondhand. The danger is setting conditions: naming the sign, fixing the deadline, and treating silence as a verdict. God has given His decisive self-revelation in Christ and in the Scriptures, so the honest place to look for Him is there rather than in a private arrangement He never agreed to. Anyone who asks for light while sincerely reading the Gospels isn’t testing God; they’re doing exactly what the evidence invites.
Related Reads
- If God Already Knows Everything, Why Does He Test Us?
- If God Is Sovereign, Why Bother Praying?
- Why Christians Fast: The Biblical Discipline’s Very Real Rewards
- The Paradox of Prayer: Why Ask When God Already Knows?
- Didn’t The Early Christians Cast Lots? Why Don’t We?
- Seek God’s Face: What Does Scripture Mean?
