Matthew 12:34
O ye generations of vipers, how are you, being evil, able to speak good things? 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 have used deceit; the poison of asps is under their lips.
2 Corinthians 11:3
but I fear, lest, as the serpent beguiled Eve by his craftiness, your minds may be corrupted from the simplicity which is in Christ.
James 3:6-8
The tongue, a fire, the world of iniquity: the tongue sits down in the midst of our members, and corrupting the whole body, and setting on fire the course of nature; and it is set on fire from hell.