Matthew 12:34
Generation of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.
Romans 3:13-14
their throat is an open sepulcher; 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 deceived Eve by his cunning, so your minds should be corrupted from the simplicity which pertains to Christ.
James 3:6-8
And the tongue is a fire, the world of iniquity. So is the tongue placed among our members, defiling the whole body, setting on fire the course of life, and being set on fire by hell.