Proverbs 10:32

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

Ecclesiastes 12:10

The preacher sought to find out acceptable words: and that which was written was upright, even words of truth.

Proverbs 2:12

To deliver thee from the way of the evil man, from the man that speaketh froward things;

Proverbs 11:11

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

Proverbs 12:6

The words of the wicked are to lie in wait for blood: but the mouth of the upright shall deliver them.

Proverbs 12:18

There is that speaketh like the piercings of a sword: but the tongue of the wise is health.

Proverbs 15:2

The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.

Proverbs 15:28

The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.

Proverbs 18:6-8

A fool's lips enter into contention, and his mouth calleth for strokes.

Ecclesiastes 10:12

The words of a wise man's mouth are gracious; but the lips of a fool will swallow up himself.

Daniel 4:27

Wherefore, O king, let my counsel be acceptable to thee, and break off thy sins by righteousness, and thy iniquities by showing mercy to the poor; if it may be a lengthening of thy tranquillity.

Titus 2:8

Sound speech that cannot be condemned; that he that is of the contrary part may be ashamed, having no evil thing to say concerning you.

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 out acceptable words: and that which was written was upright, even words of truth.
Daniel 4:27
Wherefore, O king, let my counsel be acceptable to thee, and break off thy sins by righteousness, and thy iniquities by showing mercy to the poor; if it may be a lengthening of thy tranquillity.
Titus 2:8
Sound speech that cannot be condemned; that he that is of the contrary part may be ashamed, having no evil thing to say concerning you.

General references

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