And if you say in your heart, ‘How may we know the word that the LORD has not spoken?’—
English Standard Version (ESV)
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Deuteronomy 18:21
What does Deuteronomy 18:21 mean?
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Deuteronomy 18:21
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This verse isn't just asking how to spot a fake prophet, but highlights the internal struggle of doubt—the honest question that arises in our own hearts when faced with uncertainty. It reveals that discerning God's voice isn't always about external signs, but about grappling with the profound question of what truly comes from Him.
And if you say in your heart, ‘How may we know the word that the LORD has not spoken?’—
English Standard Version (ESV)
Just before this verse, Moses instructs Israel on how to discern true prophets from false ones, laying out tests for their authenticity. This verse anticipates a natural question that would arise in their hearts: faced with competing claims, how can they tell which messages truly come from God? The verses that follow will provide that crucial test, focusing on the prophet's predictions.
Ever felt unsure if what you're hearing is really from God? You're not alone! This verse dives into that very human struggle.
The opening of Deuteronomy 18:21 isn't just a casual thought; it's the honest wrestling of the human heart when faced with uncertainty. 'And if you say in your heart...' This phrase highlights a moment of internal questioning, a deep desire to distinguish truth from falsehood. It acknowledges that genuine seekers will inevitably grapple with discerning God's voice from the many other voices competing for our attention. This isn't a sign of weak faith, but a crucial step in seeking reliable guidance.
God gives us real ways to tell His messengers apart from the frauds. It's not about magic tricks, but about reliable signs.
The core of this passage, extending beyond the snippet provided, is about how to identify a true prophet. The primary test God gives is the fulfillment of their predictions. If a prophet speaks in God's name and the predicted event doesn't happen, then they have spoken presumptuously – they weren't relaying a true word from the Lord. This is a practical, observable test. It’s a way to safeguard the people from being led astray by false claims. Importantly, this test is affirmed as more reliable than miraculous signs, which could potentially be used to deceive (as seen in Deuteronomy 13).
When all else seems confusing, there's a solid foundation for truth. What is it, and how do we access it?
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While Deuteronomy 18 provides tests for prophets, it's rooted in a foundational principle highlighted in Henry's commentary: 'Whatever is against the plain sense of the written word, or which gives countenance or encouragement to sin, we may be sure is not that which the Lord has spoken.' This points to a crucial reality: God’s ultimate standard is His revealed Word. Even if a prediction seems to come true, if the message contradicts or undermines the established truth of Scripture, it cannot be from God. This means our primary responsibility is to know and cherish God’s Word, using it as the bedrock for evaluating all other claims to divine authority.
Understand the original words
YHWH · Hebrew Proper Noun
The supreme, covenantal, and personal name of the one true God of Israel, signifying His eternal self-existence, holiness, and faithfulness to His people.
This passage shows a king turning to a false prophet for guidance out of desperation, highlighting the very human tendency to seek answers and the danger of choosing the wrong source.
Jeremiah 23:16This verse directly condemns false prophets for speaking visions from their own minds and misleading people, emphasizing the importance of discerning God's true word from human invention.
Matthew 7:15Jesus warns against false prophets who come in sheep's clothing but are inwardly ravenous wolves, teaching us that we must look beyond outward appearances to the true character and message.
1 John 4:1This verse instructs believers to test the spirits to see if they are from God, providing a crucial principle for discerning truth from error by examining the message presented.
gillDeuteronomy 18:21: "And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?"
And if thou say in thine heart, &c. Such a thought arises in the mind, and it appears to be a difficulty, and a query is made upon it: how shall we know the word which the Lord hath not spoken? What marks, signs, and criterions are those by which it may be known that it is not a word that comes from the Lord?
pooleDeuteronomy 18:21: "And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?"
No text from Poole on this verse.
This verse isn't just asking how to spot a fake prophet, but highlights the internal struggle of doubt—the honest question that arises in our own hearts when faced with uncertainty. It reveals that discerning God's voice isn't always about external signs, but about grappling with the profound question of what truly comes from Him.
Just before this verse, Moses instructs Israel on how to discern true prophets from false ones, laying out tests for their authenticity. This verse anticipates a natural question that would arise in their hearts: faced with competing claims, how can they tell which messages truly come from God? The verses that follow will provide that crucial test, focusing on the prophet's predictions.
Just before this verse, Moses instructs Israel on how to discern true prophets from false ones, laying out tests for their authenticity. This verse anticipates a natural question that would arise in their hearts: faced with competing claims, how can they tell which messages truly come from God? The verses that follow will provide that crucial test, focusing on the prophet's predictions.
"And if you say in your heart, ‘How may we know the word that the LORD has not spoken?’—" — This verse isn't just asking how to spot a fake prophet, but highlights the internal struggle of doubt—the honest question that arises in our own hearts when faced with uncertainty. It reveals that d…
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Last reviewed October 2026