James 3:8

But the tongue may not be controlled by man; it is an unresting evil, it is full of the poison of death.

Psalm 140:3

Their tongues are sharp like the tongue of a snake; the poison of snakes is under their lips. (Selah.)

Romans 3:13

Their throat is like an open place of death; with their tongues they have said what is not true: the poison of snakes is under their lips:

Ecclesiastes 10:11

If a snake gives a bite before the word of power is said, then there is no longer any use in the word of power.

Deuteronomy 32:33

Their wine is the poison of dragons, the cruel poison of snakes.

Psalm 55:21

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

Psalm 57:4

My soul is among lions; I am stretched out among those who are on fire, even the sons of men, whose teeth are spears and arrows, and whose tongue is a sharp sword.

Psalm 58:4

Their poison is like the poison of a snake; they are like the adder, whose ears are shut;

Psalm 59:7

See, hate is dropping from their lips; curses are on their tongues: they say, Who gives attention to it?

Psalm 64:3-4

Who make their tongues sharp like a sword, and whose arrows are pointed, even bitter words;

James 3:6

And the tongue is a fire; it is the power of evil placed in our bodies, making all the body unclean, putting the wheel of life on fire, and getting its fire from hell.

Revelation 12:9

And the great dragon was forced down, the old snake, who is named the Evil One and Satan, by whom all the earth is turned from the right way; he was forced down to the earth, and his angels were forced down 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; it is the power of evil placed in our bodies, making all the body unclean, putting the wheel of life on fire, and getting its 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, but they were sharp swords.
Psalm 57:4
My soul is among lions; I am stretched out among those who are on fire, even the sons of men, whose teeth are spears and arrows, and whose tongue is a sharp sword.
Psalm 59:7
See, hate is dropping from their lips; curses are on their tongues: they say, Who gives attention to it?
Psalm 64:3
Who make their tongues sharp like a sword, and whose arrows are pointed, even bitter words;

Full

Deuteronomy 32:33
Their wine is the poison of dragons, the cruel poison of snakes.
Psalm 58:4
Their poison is like the poison of a snake; they are like the adder, whose ears are shut;
Psalm 140:3
Their tongues are sharp like the tongue of a snake; the poison of snakes is under their lips. (Selah.)
Ecclesiastes 10:11
If a snake gives a bite before the word of power is said, then there is no longer any use in the word of power.
Romans 3:13
Their throat is like an open place of death; with their tongues they have said what is not true: the poison of snakes is under their lips:
Revelation 12:9
And the great dragon was forced down, the old snake, who is named the Evil One and Satan, by whom all the earth is turned from the right way; he was forced down to the earth, and his angels were forced down with him.

General references

Matthew 15:18
But the things which come out of the mouth come from the heart; and they make a man unclean.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain