Matthew 12:34
Ye broods of vipers, how can ye speak good things, yourselves being wicked? for out of the abundance of the heart the mouth speaketh.
Romans 3:13-14
Their throat is an open sepulchre; with their tongues they have spoken craftily; the poison of asps is under their lips:
2 Corinthians 11:3
But I fear lest as the serpent beguiled Eve by his craftiness, so your minds should be corrupted from the simplicity which belongs to Christ.
James 3:6-8
And the tongue is a fire, a world of iniquity: in such manner is the tongue placed among our members, that it defileth all the body, and setteth on fire the circle of nature; and is set on fire of hell.