Psalm 141:3 Set a watch, O LORD, before my mouth; keep the door of my lips.
Matthew 15:11 Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
Proverbs 16:28 A froward man soweth strife: and a whisperer separateth chief friends.
James 3:8,10 But the tongue can no man tame; it is an unruly evil, full of deadly poison. Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
Colossians 3:8 But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.