Psalms 50:19

His mouth is full of cursing and deceit and fraud: under his tongue is mischief and vanity.

And they will deceive every one his neighbour, and will not speak the truth: they have taught their tongue to speak lies, and weary themselves to commit iniquity.

Thy tongue deviseth mischiefs; like a sharp razor, working deceitfully. Thou lovest evil more than good; and lying rather than to speak righteousness. Selah. Thou lovest all devouring words, O thou deceitful tongue.

The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords.

But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.

By swearing, and lying, and killing, and stealing, and committing adultery, they break out, and blood toucheth blood.

For your hands are defiled with blood, and your fingers with iniquity; your lips have spoken lies, your tongue hath muttered perverseness. None calleth for justice, nor any pleadeth for truth: they trust in vanity, and speak lies; they conceive mischief, and bring forth iniquity.

Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth! 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. For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind: But the tongue can no man tame; it is an unruly evil, full of deadly poison. Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God.

They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak. The Lord shall cut off all flattering lips, and the tongue that speaketh proud things:

The words of his mouth are iniquity and deceit: he hath left off to be wise, and to do good. He deviseth mischief upon his bed; he setteth himself in a way that is not good; he abhorreth not evil.

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.

For it was not an enemy that reproached me; then I could have borne it: neither was it he that hated me that did magnify himself against me; then I would have hid myself from him:

Who whet their tongue like a sword, and bend their bows to shoot their arrows, even bitter words: That they may shoot in secret at the perfect: suddenly do they shoot at him, and fear not. They encourage themselves in an evil matter: they commune of laying snares privily; they say, Who shall see them?

Their throat is an open sepulchre; with their tongues they have used deceit; the poison of asps is under their lips: Whose mouth is full of cursing and bitterness: