Matthew 12:35

A good man out of the good treasure of his heart bringeth forth good things: and a wicked man out of the evil treasure of his heart bringeth forth evil things.

Ephesians 4:29

Let no loose discourse proceed out of your mouth, but whatever is good for useful edification, that it may communicate grace to the hearers.

Colossians 4:6

Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.

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
A good man out of the good treasure of his heart bringeth forth good things: and a wicked man out of the evil treasure of his heart bringeth forth evil things.
Ephesians 4:29
Let no loose discourse proceed out of your mouth, but whatever is good for useful edification, that it may communicate grace to the hearers.
Colossians 4:6
Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.