Matthew 15:18
But those things which proceed out of the mouth come from the heart, and they defile a man.
Matthew 12:34
You brood of vipers! how can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.
Matthew 15:11
not what goes into the mouth defiles a man, but what comes out of the mouth, this defiles a man."
James 3:6-10
And the tongue is a fire, a world of evil among the members of the body. The tongue corrupts our whole person, sets the whole course of our life on fire, and is itself set on fire by hell.
Luke 19:22
He said to him, 'I will judge you out of your own mouth, you wicked servant! You knew that I was a hard man, taking up what I did not lay down and reaping what I did not sow?
Revelation 13:5-6
And the beast was given a mouth speaking arrogant words and blasphemies, and it was allowed to exercise authority for forty-two months.