Matthew 12:35
"A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things."
Cross References (ranked by relevance)
A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit.
Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.
The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
The words of the wicked are to lie in wait for blood: but the mouth of the upright shall deliver them.
A man hath joy by the answer of his mouth: and a word spoken in due season, how good is it!
Then said he unto them, Therefore every scribe which is instructed unto the kingdom of heaven is like unto a man that is an householder, which bringeth forth out of his treasure things new and old.