Matthew 12:35

The good man, out of his good treasure, puts forth good things; and the evil man, out of his evil treasure, puts forth evil things.

Ephesians 4:29

Let no corrupt speech proceed out of your mouth, but whatever is good for the supplying of the need, that it may give grace to those who hear.

Colossians 4:6

Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer each one.

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

Matthew 12:35
The good man, out of his good treasure, puts forth good things; and the evil man, out of his evil treasure, puts forth evil things.
Ephesians 4:29
Let no corrupt speech proceed out of your mouth, but whatever is good for the supplying of the need, that it may give grace to those who hear.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer each one.