Matthew 12:34
"You generation of vipers! How can you speak good, when you are evil? For the mouth speaks what the heart is full of. "When the time of fruit drew near, he sent his slaves to the vine-dressers seized to get his fruit.
Romans 3:13-14
Their throat is an open grave; With their tongues they have used deceit. The venom of asps is under their lips.
2 Corinthians 11:3
But I fear lest, just as the serpent beguiled Eve in his craftiness, so your minds should be seduced from your single-mindedness and purity toward Christ.
James 3:6-8
And the tongue is a fire; it is a very world of iniquity among our members, defiling the whole body, and setting on fire the wheel of nature, and is itself set on fire by hell.