Romans 3:13
"Their throat is an open grave; they use their tongues to practice deceit." "The poison of asps is under their lips."
Matthew 12:34-35
You brood of vipers! how can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.
Matthew 23:27-28
Woe to you, scribes and Pharisees, hypocrites! For you are like whitewashed tombs which outwardly appear beautiful, but inside they are full of dead men's bones and all uncleanness.
Romans 3:4
Certainly not! Let God be true, though every man a liar. As it is written: "That you may be justified in your words and prevail when you are judged."
James 3:5-8
So also the tongue is a small part of the body, and yet it boasts of great things. See how great a forest is set aflame by such a small fire!