Proverbs 10:32

The lips of the righteous know what is acceptable, but the mouth of the wicked, what is perverse.

Ecclesiastes 12:10

The Preacher sought to find words of delight, and uprightly he wrote words of truth.

Proverbs 2:12

delivering you from the way of evil, from men of perverted speech,

Proverbs 11:11

By the blessing of the upright a city is exalted, but by the mouth of the wicked it is overthrown.

Proverbs 12:6

The words of the wicked lie in wait for blood, but the mouth of the upright delivers them.

Proverbs 12:18

There is one whose rash words are like sword thrusts, but the tongue of the wise brings healing.

Proverbs 15:2

The tongue of the wise commends knowledge, but the mouths of fools pour out folly.

Proverbs 15:28

The heart of the righteous ponders how to answer, but the mouth of the wicked pours out evil things.

Proverbs 18:6-8

A fool's lips walk into a fight, and his mouth invites a beating.

Ecclesiastes 10:12

The words of a wise man's mouth win him favor, but the lips of a fool consume him.

Daniel 4:27

Therefore, O king, let my counsel be acceptable to you: break off your sins by practicing righteousness, and your iniquities by showing mercy to the oppressed, that there may perhaps be a lengthening of your prosperity."

Titus 2:8

and sound speech that cannot be condemned, so that an opponent may be put to shame, having nothing evil to say about us.

Treasury of Scripture Knowledge

Summary

The lips of the righteous know what is acceptable: but the mouth of the wicked speaketh frowardness.

General references

Bible References

Know

Ecclesiastes 12:10
The Preacher sought to find words of delight, and uprightly he wrote words of truth.
Daniel 4:27
Therefore, O king, let my counsel be acceptable to you: break off your sins by practicing righteousness, and your iniquities by showing mercy to the oppressed, that there may perhaps be a lengthening of your prosperity."
Titus 2:8
and sound speech that cannot be condemned, so that an opponent may be put to shame, having nothing evil to say about us.

General references

Matthew 15:18
But what comes out of the mouth proceeds from the heart, and this defiles a person.

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.