Matthew 15:18
"But those things which proceed out of the mouth come forth from the heart; and they defile the man."
Cross References (ranked by relevance)
The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.
O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
The lips of the righteous know what is acceptable: but the mouth of the wicked speaketh frowardness.
The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.
A naughty person, a wicked man, walketh with a froward mouth.
And he saith unto him, Out of thine own mouth will I judge thee, thou wicked servant. Thou knewest that I was an austere man, taking up that I laid not down, and reaping that I did not sow:
As saith the proverb of the ancients, Wickedness proceedeth from the wicked: but mine hand shall not be upon thee.
The words of his mouth are iniquity and deceit: he hath left off to be wise, and to do good.