Matthew 12:34
Offspring 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 opened tomb, with their tongues they practise deceit, the poison of asps is under their lips.
2 Corinthians 11:3
but I fear lest as the serpent deceived Eve with his craftiness, so also your minds may be corrupted from the simplicity which is in Christ.
James 3:6-8
And the tongue is a fire, the tongue is made a world of wickedness among our members, it defiles the whole body and sets on fire the course of nature and is set on fire by hell.