Romans

For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulchre; they flatter with their tongue.

But the tongue can no man tame; it is an unruly evil, full of deadly poison.

They have sharpened their tongues like a serpent; adders’ poison is under their lips. Selah.

A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh.

Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.