'Rein' in the Bible

So the horseman went to meet him and said, “Thus says the king: ‘Do you come in peace?’” And Jehu said, “What have you to do with peace? Rein in behind me.” And the watchman reported, “The messenger approached them, but he has not returned.”

Do not be like a horse [or] like a mule, without understanding; [that needs] his tackle--bridle and rein--for restraint [or he would not] come near you.

You give your mouth free rein for evil, and you harness your tongue to deceit.