Proverbs 30:32 in the World English Bible
“If you have done foolishly in lifting up yourself, or if you have thought evil, put your hand over your mouth.
Context
31 A greyhound; an he goat also; and a king, against whom there is no rising up.
32 If thou hast done foolishly in lifting up thyself, or if thou hast thought evil, lay thine hand upon thy mouth.
33 Surely the churning of milk bringeth forth butter, and the wringing of the nose bringeth forth blood: so the forcing of wrath bringeth forth strife.