3 Bible Verses about Making God A Liar

Whoever believes in the Son of God has the testimony in himself. Whoever does not believe God has made him a liar, because he has not believed in the testimony that God has borne concerning his Son.

If we say we have not sinned, we make him a liar, and his word is not in us.

"How can you say, 'We are wise, and the law of the LORD is with us'? But behold, the lying pen of the scribes has made it into a lie.