Deuteronomy 18:21

NIV: You may say to yourselves, "How can we know when a message has not been spoken by the LORD?"

NAS: "You may say in your heart, 'How will we know the word which the LORD has not spoken?'

KJV: And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?

GWT: You may be wondering, "How can we recognize that the LORD didn't speak this message?"

ASV: And if thou say in thy heart, How shall we know the word which Jehovah hath not spoken?

BBE: And if you say in your hearts, How are we to be certain that the word does not come from the Lord?

DBY: And if thou say in thy heart, How shall we know the word that Jehovah hath not spoken?

DRB: And if in silent thought thou answer: How shall I know the word that the Lord hath not spoken?

WBS: And if thou shalt say in thy heart, How shall we know the word which the LORD hath not spoken?

WEB: If you say in your heart, "How shall we know the word which Yahweh has not spoken?"

YLT: 'And when thou sayest in thy heart, How do we know the word which Jehovah hath not spoken? --