Proverbs 17:20
"He that hath a froward heart findeth no good: and he that hath a perverse tongue falleth into mischief."
Cross References (ranked by relevance)
The mouth of the just bringeth forth wisdom: but the froward tongue shall be cut out.
For the froward is abomination to the LORD: but his secret is with the righteous.
The words of a wise man’s mouth are gracious; but the lips of a fool will swallow up himself.
He that winketh with the eye causeth sorrow: but a prating fool shall fall.
With the pure thou wilt shew thyself pure; and with the froward thou wilt shew thyself froward.
Wise men lay up knowledge: but the mouth of the foolish is near destruction.
The fear of the LORD is to hate evil: pride, and arrogancy, and the evil way, and the froward mouth, do I hate.