'Liar' in the Bible

The father whose sons you are is the Devil; and you desire to do what gives him pleasure. *He* was a murderer from the beginning, and does not stand firm in the truth--for there is no truth in him. Whenever he utters his lie, he utters it out of his own store; for he is a liar, and the father of lies.

You do not know Him, but I know Him perfectly; and were I to deny my knowledge of Him, I should resemble you, and be a liar. On the contrary I do know Him, and I obey His commands.

If we deny that we have sinned, we make Him a liar, and His Message has no place in our hearts.

He who professes to know Him, and yet does not obey His commands, is a liar, and the truth has no place in his heart.

Who is a liar compared with him who denies that Jesus is the Christ? He who disowns the Father and the Son is the anti-Christ.

If any one says that he loves God, while he hates his brother man, he is a liar; for he who does not love his brother man whom he has seen, cannot love God whom he has not seen.

He who believes in the Son of God has the testimony in his own heart: he who does not believe God has made Him a liar, in that he has refused to accept the testimony which God has given about His Son.