Matthew 15:18
But those things going out from the mouth come forth from the heart; and these pollute the man.
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.
Matthew 15:11
That if which cometh into the mouth does not defile the man; but that which cometh out from the mouth, that defiles the man.
James 3:6-10
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.
Luke 19:22
And he says to him, Out of thine own mouth I will judge thee, thou wicked servant. Didst thou know that I am an austere man, taking up what I have not laid down, and reaping what I have not sown?
Revelation 13:5-6
and a mouth was given to him speaking great things and blasphemies; and authority was given unto him to prevail forty-two months.