Job

Behold, I am vile; what shall I answer thee? I will lay mine hand upon my mouth.

And they said unto him, Hold thy peace, lay thine hand upon thy mouth, and go with us, and be to us a father and a priest: is it better for thee to be a priest unto the house of one man, or that thou be a priest unto a tribe and a family in Israel?

The princes refrained talking, and laid their hand on their mouth.

If thou hast done foolishly in lifting up thyself, or if thou hast thought evil, lay thine hand upon thy mouth.

Therefore the prudent shall keep silence in that time; for it is an evil time.