James 3:8

But no human being can subdue the tongue; it is a restless evil, full of deadly poison.

Psalm 140:3

Their tongues wound like a serpent; a viper's venom is behind their lips. (Selah)

Romans 3:13

"Their throats are open graves, they deceive with their tongues, the poison of asps is under their lips."

Ecclesiastes 10:11

If the snake should bite before it is charmed, the snake charmer is in trouble.

Deuteronomy 32:33

Their wine is snakes' poison, the deadly venom of cobras.

Psalm 55:21

His words are as smooth as butter, but he harbors animosity in his heart. His words seem softer than oil, but they are really like sharp swords.

Psalm 57:4

I am surrounded by lions; I lie down among those who want to devour me; men whose teeth are spears and arrows, whose tongues are a sharp sword.

Psalm 58:4

Their venom is like that of a snake, like a deaf serpent that does not hear,

Psalm 59:7

Look, they hurl insults at me and openly threaten to kill me, for they say, "Who hears?"

Psalm 64:3-4

They sharpen their tongues like a sword; they aim their arrow, a slanderous charge,

James 3:6

And the tongue is a fire! The tongue represents the world of wrongdoing among the parts of our bodies. It pollutes the entire body and sets fire to the course of human existence -- and is set on fire by hell.

Revelation 12:9

So that huge dragon -- the ancient serpent, the one called the devil and Satan, who deceives the whole world -- was thrown down to the earth, and his angels along 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! The tongue represents the world of wrongdoing among the parts of our bodies. It pollutes the entire body and sets fire to the course of human existence -- and is set on fire by hell.
Psalm 55:21
His words are as smooth as butter, but he harbors animosity in his heart. His words seem softer than oil, but they are really like sharp swords.
Psalm 57:4
I am surrounded by lions; I lie down among those who want to devour me; men whose teeth are spears and arrows, whose tongues are a sharp sword.
Psalm 59:7
Look, they hurl insults at me and openly threaten to kill me, for they say, "Who hears?"
Psalm 64:3
They sharpen their tongues like a sword; they aim their arrow, a slanderous charge,

Full

Deuteronomy 32:33
Their wine is snakes' poison, the deadly venom of cobras.
Psalm 58:4
Their venom is like that of a snake, like a deaf serpent that does not hear,
Psalm 140:3
Their tongues wound like a serpent; a viper's venom is behind their lips. (Selah)
Ecclesiastes 10:11
If the snake should bite before it is charmed, the snake charmer is in trouble.
Romans 3:13
"Their throats are open graves, they deceive with their tongues, the poison of asps is under their lips."
Revelation 12:9
So that huge dragon -- the ancient serpent, the one called the devil and Satan, who deceives the whole world -- was thrown down to the earth, and his angels along with him.

General references

Matthew 15:18
But the things that come out of the mouth come from the heart, and these things defile a person.

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