Proverbs 17:27
He that has knowledge spares his words: and a man of understanding is of an excellent spirit.
Nave's Topical Index—AKJV

Proverbs 21:23
Whoever keeps his mouth and his tongue keeps his soul from troubles.
Nave's Topical Index—AKJV

Ecclesiastes 3:7
A time to rend, and a time to sew; a time to keep silence, and a time to speak;
Nave's Topical Index—AKJV