Proverbs 10:32

The lips of a righteous man know what is acceptable; but the mouth of the wicked is frowardness.

Ecclesiastes 12:10

The Preacher sought to find out acceptable words; and that which was written is upright, words of truth.

Proverbs 2:12

To deliver thee from the way of evil, 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 a lying-in-wait for blood; but the mouth of the upright shall deliver them.

Proverbs 12:18

There is that babbleth 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 the foolish poureth out folly.

Proverbs 15:28

The heart of a righteous man 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 stripes.

Ecclesiastes 10:12

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

Daniel 4:27

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

Titus 2:8

a sound word, not to be condemned; that he who is opposed may be ashamed, having no evil thing 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 out acceptable words; and that which was written is upright, words of truth.
Daniel 4:27
Therefore, O king, let my counsel be acceptable unto thee, and break off thy sins by righteousness, and thine iniquities by shewing mercy to the poor; if it may be a lengthening of thy tranquillity.
Titus 2:8
a sound word, not to be condemned; that he who is opposed may be ashamed, having no evil thing to say about us:

General references

Matthew 15:18
but the things which go forth out of the mouth come out of the heart, and those defile man.