'Liar' in the Bible

"If this is not so, who can prove me a liar and reduce my words to nothing?"

One who acts wickedly pays attention to evil counsel; a liar listens to a malicious tongue.

What is desirable for a person is to show loyal love, and a poor person is better than a liar.

Do not add to his words, lest he reprove you, and prove you to be a liar.