Job 21:5

"The princes refrained talking, and laid their hand on their 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?"

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

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

"O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out!"

"I was dumb, I opened not my mouth; because thou didst it."

"Upright men shall be astonied at this, and the innocent shall stir up himself against the hypocrite."

"The nations shall see and be confounded at all their might: they shall lay their hand upon their mouth, their ears shall be deaf."

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