'Liar' in the Bible

You are of your father, the devil, and you want to do the desires of your father. He was a murderer from the beginning, and doesn't stand in the truth, because there is no truth in him. When he speaks a lie, he speaks on his own; for he is a liar, and its father.

You have not known him, but I know him. If I said, 'I don't know him,' I would be like you, a liar. But I know him, and keep his word.

May it never be! Yes, let God be found true, but every man a liar. As it is written, "That you might be justified in your words, and might prevail when you come into judgment."

If we say that we haven't sinned, we make him a liar, and his word is not in us.

One who says, "I know him," and doesn't keep his commandments, is a liar, and the truth isn't in him.

Who is the liar but he who denies that Jesus is the Christ? This is the Antichrist, he who denies the Father and the Son.

If a man says, "I love God," and hates his brother, he is a liar; for he who doesn't love his brother whom he has seen, how can he love God whom he has not seen?

He who believes in the Son of God has the testimony in himself. He who doesn't believe God has made him a liar, because he has not believed in the testimony that God has given concerning his Son.