Matthew 12:35

A good man, from his good stores, produces good things; while an evil man, from his evil stores, produces evil things.

Ephesians 4:29

Never let any foul word pass your lips, but only such good words as the occasion demands, that they may be a help to those who hear them.

Colossians 4:6

Let your conversation always be kindly, and seasoned, as it were, with salt; that you may know in each case what answer you ought to give.

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, from his good stores, produces good things; while an evil man, from his evil stores, produces evil things.
Ephesians 4:29
Never let any foul word pass your lips, but only such good words as the occasion demands, that they may be a help to those who hear them.
Colossians 4:6
Let your conversation always be kindly, and seasoned, as it were, with salt; that you may know in each case what answer you ought to give.