Psalm 37:30

The mouth of the righteous is exercised in wisdom, and his tongue talketh of judgment.

Psalm 71:15

My mouth shall speak daily of thy righteousness and salvation; for I know no end thereof.

Deuteronomy 6:7-9

And thou shalt whet them on thy children, and shalt talk of them when thou art at home in thine house and as thou walkest by the way; and when thou liest down and when thou risest up.

Psalm 71:24

My tongue talketh of thy righteousness, all the day long; for they are confounded and brought unto shame that seek to do me evil.

Proverbs 10:21

The lips of the righteous feed a whole multitude; but fools shall die in their own folly.

Proverbs 10:31

The mouth of the just will be talking of wisdom; but the tongue of the froward shall perish.

Proverbs 15:7

A wise mouth poureth out knowledge; but the heart of the foolish doth not so.

Proverbs 25:11-13

A word spoken in due season, is like apples of gold in a silver dish.

Proverbs 27:9

The heart is glad of a sweet ointment and savour, but a stomach that can give good counsel, rejoiceth a man's neighbour.

Matthew 12:35

A good man out of the good treasure of his heart, bringeth forth good things. And an evil man out of his evil treasure, bringeth forth evil things.

Ephesians 4:29

Let no filthy communication proceed out of your mouths: but that which is good to edify withal, when need is, that it may have favour with the hearers.

Colossians 4:6

Let your speech be always well favoured and be powdered with salt, that ye may know how to answer every man.

Treasury of Scripture Knowledge

Summary

The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.

Bible References

General references

Psalm 71:15
My mouth shall speak daily of thy righteousness and salvation; for I know no end thereof.
Deuteronomy 6:7
And thou shalt whet them on thy children, and shalt talk of them when thou art at home in thine house and as thou walkest by the way; and when thou liest down and when thou risest up.
Proverbs 10:21
The lips of the righteous feed a whole multitude; but fools shall die in their own folly.
Proverbs 15:7
A wise mouth poureth out knowledge; but the heart of the foolish doth not so.
Proverbs 25:11
A word spoken in due season, is like apples of gold in a silver dish.
Proverbs 27:9
The heart is glad of a sweet ointment and savour, but a stomach that can give good counsel, rejoiceth a man's neighbour.
Matthew 12:35
A good man out of the good treasure of his heart, bringeth forth good things. And an evil man out of his evil treasure, bringeth forth evil things.
Ephesians 4:29
Let no filthy communication proceed out of your mouths: but that which is good to edify withal, when need is, that it may have favour with the hearers.
Colossians 4:6
Let your speech be always well favoured and be powdered with salt, that ye may know how to answer every man.