Proverbs 10:32

The lips of the righteous know a pleasing thing, And the mouth of the wicked perverseness!

Ecclesiastes 12:10

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

Proverbs 2:12

To deliver thee from an evil way, From any speaking froward things,

Proverbs 11:11

By the blessing of the upright is a city exalted, And by the mouth of the wicked thrown down.

Proverbs 12:6

The words of the wicked are: 'Lay wait for blood,' And the mouth of the upright delivereth them.

Proverbs 12:18

A rash speaker is like piercings of a sword, And the tongue of the wise is healing.

Proverbs 15:2

The tongue of the wise maketh knowledge good, And the mouth of fools uttereth folly.

Proverbs 15:28

The heart of the righteous meditateth to answer, And the mouth of the wicked uttereth evil things.

Proverbs 18:6-8

The lips of a fool enter into strife, And his mouth for stripes calleth.

Ecclesiastes 10:12

Words of the mouth of the wise are gracious, And the lips of a fool swallow him up.

Daniel 4:27

'Therefore, O king, let my counsel be acceptable unto thee, and thy sins by righteousness break off, and thy perversity by pitying the poor, lo, it is a lengthening of thine ease.

Titus 2:8

discourse sound, irreprehensible, that he who is of the contrary part may be ashamed, having nothing evil 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 pleasing words, and, written by the upright, words of truth.
Daniel 4:27
'Therefore, O king, let my counsel be acceptable unto thee, and thy sins by righteousness break off, and thy perversity by pitying the poor, lo, it is a lengthening of thine ease.
Titus 2:8
discourse sound, irreprehensible, that he who is of the contrary part may be ashamed, having nothing evil to say concerning you.

General references

Matthew 15:18
but the things coming forth from the mouth from the heart do come forth, and these defile the man;