Proverbs 13:3

He who keeps his mouth keeps his life; he who opens his lips wide, it is ruin to him.

Proverbs 21:23

Whoever keeps his mouth and his tongue keeps his soul from troubles.

Proverbs 12:13

The wicked is snared by the transgression of his lips, but the just shall come out of trouble.

Proverbs 18:7

A fool's mouth is his destruction, and his lips are the snare of his soul.

Proverbs 18:21

Death and life are in the power of the tongue, and those who love it shall eat the fruit of it.

Psalm 39:1

To the Chief Musician, to Jeduthun. A Psalm of David. I said, I will take heed to my ways so that I do not sin with my tongue; I will keep my mouth with a bridle while the wicked are before me.

Proverbs 10:19

In the multitude of words, sin is not lacking; but he who holds back his lips is wise.

Proverbs 20:19

A gossip is a revealer of secrets; so do not mix with him who flatters with his lips.

Matthew 12:36-37

But I say to you that every idle word, whatever men may speak, they shall give account of it in the day of judgment.

James 1:26

If anyone thinks to be religious among you, yet does not bridle his tongue, but deceives his own heart, this one's religion is vain.

James 3:2-12

For in many things we all offend. If anyone does not offend in word, the same is a full-grown man, able also to bridle the whole body.

Treasury of Scripture Knowledge

Summary

He that keepeth his mouth keepeth his life: but he that openeth wide his lips shall have destruction.

Bible References

General references

Proverbs 10:19
In the multitude of words, sin is not lacking; but he who holds back his lips is wise.
Proverbs 12:13
The wicked is snared by the transgression of his lips, but the just shall come out of trouble.
Proverbs 21:23
Whoever keeps his mouth and his tongue keeps his soul from troubles.
Psalm 39:1
To the Chief Musician, to Jeduthun. A Psalm of David. I said, I will take heed to my ways so that I do not sin with my tongue; I will keep my mouth with a bridle while the wicked are before me.
Matthew 12:36
But I say to you that every idle word, whatever men may speak, they shall give account of it in the day of judgment.
James 1:26
If anyone thinks to be religious among you, yet does not bridle his tongue, but deceives his own heart, this one's religion is vain.
James 3:2
For in many things we all offend. If anyone does not offend in word, the same is a full-grown man, able also to bridle the whole body.