'Liar' in the Bible

Ye are of the devil, as your father, and ye desire to do the lusts of your father. He was a murderer from the beginning, and has not stood in the truth, because there is no truth in him. When he speaks falsehood, he speaks of what is his own; for he is a liar and its father:

And ye know him not; but I know him; and if I said, I know him not, I should be like you, a liar. But I know him, and I keep his word.