James 3:8

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

Psalm 140:3

They have sharpened their tongues like a serpent; adder's poison is under their lips. Selah.

Romans 3:13

Their throat is an open sepulcher; with their tongues they have used deceit; the poison of asps is under their lips:

Ecclesiastes 10:11

Surely the serpent will bite without enchantment; and a babbler is no better.

Deuteronomy 32:33

Their wine is the poison of dragons, and the cruel venom of asps.

Psalm 55:21

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.

Psalm 57:4

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.

Psalm 58:4

Their poison is like the poison of a serpent: they are like the deaf adder that stoppeth her ear;

Psalm 59:7

Behold, they belch out with their mouth: swords are in their lips: for who, say they, doth hear?

Psalm 64:3-4

Who whet their tongue like a sword, and bend their bows to shoot their arrows, even bitter words:

James 3:6

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 from hell.

Revelation 12:9

And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out upon the earth, and his angels were cast out with him.

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

An unruly

James 3:6
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 from hell.
Psalm 55:21
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.
Psalm 57:4
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.
Psalm 59:7
Behold, they belch out with their mouth: swords are in their lips: for who, say they, doth hear?
Psalm 64:3
Who whet their tongue like a sword, and bend their bows to shoot their arrows, even bitter words:

Full

Deuteronomy 32:33
Their wine is the poison of dragons, and the cruel venom of asps.
Psalm 58:4
Their poison is like the poison of a serpent: they are like the deaf adder that stoppeth her ear;
Psalm 140:3
They have sharpened their tongues like a serpent; adder's poison is under their lips. Selah.
Ecclesiastes 10:11
Surely the serpent will bite without enchantment; and a babbler is no better.
Romans 3:13
Their throat is an open sepulcher; with their tongues they have used deceit; the poison of asps is under their lips:
Revelation 12:9
And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out upon the earth, and his angels were cast out with him.

General references

Matthew 15:18
But those things which proceed out of the mouth come forth from the heart; and they defile the man.