Proverbs 15:4 Proverbs 16:24 Proverbs 18:4 Proverbs 25:11 Ephesians 4:29 Colossians 4:6

Proverbs 15:4
A wholesome tongue is a tree of life: 

Proverbs 16:24
Pleasant words are as a honeycomb, sweet to the soul, and health to the bones.

Proverbs 18:4
The words of a man's mouth are like deep waters, and the wellspring of wisdom like a flowing brook.

Proverbs 25:11
A word fitly spoken is like apples of gold in settings of silver

Ephesians 4:29
Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.

Colossians 4:6
Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every man.