Matthew 12:34
"Broods of vipers! how can ye speak good things, being yourselves evil? For, out of the abundance of the heart, the mouth speaks.
Romans 3:13-14
their throat is an open sepulchre; with their tongues they used deceit; the poison of asps is under their lips;
2 Corinthians 11:3
but I fear lest, by any means, as the serpent beguiled Eve in his craftiness, your minds should be corrupted from the simplicity and purity which is toward Christ.
James 3:6-8
And the tongue is a fire, the world of iniquity! the tongue is placed among our members, as that which defiles the whole body, and sets on fire the course of life, and is set on fire by Hell.