Matthew 12:34
You brood of vipers! How can you, wicked as you are, say anything that is good? For the mouth talks about the things that fill the heart.
Romans 3:13-14
Their throats are just like open graves, with their tongues they have spoken treachery; the poison of asps is under their lips.
2 Corinthians 11:3
But I am apprehensive that, somehow or other, as the serpent by his cunning deceived Eve, your thoughts may be turned aside from single-hearted devotion to Christ.
James 3:6-8
And the tongue is a fire, and takes its place among the parts of our bodies as a world of evil; it soils the whole body and sets on fire the circle of man's nature, and itself is set on fire by hell.