Proverbs 16:27
"An ungodly man diggeth up evil: and in his lips there is as a burning fire."
Cross References (ranked by relevance)
And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.
Frowardness is in his heart, he deviseth mischief continually; he soweth discord.
A naughty person, a wicked man, walketh with a froward mouth.
Woe unto them that draw iniquity with cords of vanity, and sin as it were with a cart rope:
Now therefore know and consider what thou wilt do; for evil is determined against our master, and against all his household: for he is such a son of Belial, that a man cannot speak to him.
My soul is among lions: and I lie even among them that are set on fire, even the sons of men, whose teeth are spears and arrows, and their tongue a sharp sword.
If thou seekest her as silver, and searchest for her as for hid treasures;
Behold, is it not of the LORD of hosts that the people shall labour in the very fire, and the people shall weary themselves for very vanity?
And there happened to be there a man of Belial, whose name was Sheba, the son of Bichri, a Benjamite: and he blew a trumpet, and said, We have no part in David, neither have we inheritance in the son of Jesse: every man to his tents, O Israel.