Proverbs 10:32

The lips of the righteous know what is pleasing; but the mouth of the wicked what is contrary.

Ecclesiastes 12:10

The preacher sought to find out pleasing words; and words of truth written by the upright.

Proverbs 2:12

to deliver you from the way of the evil man, from the man who speaks wicked things;

Proverbs 11:11

By the blessing of the upright the city is lifted up, 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 are those who speak like the thrusts of a sword, but the tongue of the wise heals.

Proverbs 15:2

The tongue of the wise uses knowledge rightly, but the mouth of fools pours out foolishness.

Proverbs 15:28

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

Proverbs 18:6-8

A fool's lips enter into argument, and his mouth calls for strokes.

Ecclesiastes 10:12

The words of a wise mouth are gracious; but the lips of a fool will swallow him.

Daniel 4:27

Therefore, O king, let my advice be pleasing to you, and break off your sins by righteousness, and your iniquities by showing mercy to the poor, whether there will be duration to your prosperity.

Titus 2:8

in sound speech that cannot be condemned, that he who is opposed may be ashamed, having no evil thing to say of 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 pleasing words; and words of truth written by the upright.
Daniel 4:27
Therefore, O king, let my advice be pleasing to you, and break off your sins by righteousness, and your iniquities by showing mercy to the poor, whether there will be duration to your prosperity.
Titus 2:8
in sound speech that cannot be condemned, that he who is opposed may be ashamed, having no evil thing to say of you.

General references

Matthew 15:18
But the things which come out of the mouth come from the heart, and they defile the man.