'Liar' in the Bible

You people are from your father the devil, and you want to do what your father desires. He was a murderer from the beginning, and does not uphold the truth, because there is no truth in him. Whenever he lies, he speaks according to his own nature, because he is a liar and the father of lies.

Yet you do not know him, but I know him. If I were to say that I do not know him, I would be a liar like you. But I do know him, and I obey his teaching.

Absolutely not! Let God be proven true, and every human being shown up as a liar, just as it is written: "so that you will be justified in your words and will prevail when you are judged."

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

The one who says "I have come to know God" and yet does not keep his commandments is a liar, and the truth is not in such a person.

Who is the liar but the person who denies that Jesus is the Christ? This one is the antichrist: the person who denies the Father and the Son.

If anyone says "I love God" and yet hates his fellow Christian, he is a liar, because the one who does not love his fellow Christian whom he has seen cannot love God whom he has not seen.

(The one who believes in the Son of God has the testimony in himself; the one who does not believe God has made him a liar, because he has not believed in the testimony that God has testified concerning his Son.)