Bridle
Bridle in Scripture translates several Hebrew words used both literally for the bit and bridle used to control horses and donkeys, and metaphorically for the control of human speech and passion. Psalm 32:9 warns against being like a horse or mule “which must be curbed with bit and bridle”—lacking the understanding to be guided by gentle instruction and requiring forcible restraint. The image of God placing a hook in the nose or a bridle in the mouth of an arrogant king (2 Kings 19:28; Isa. 37:29) expresses divine sovereignty over human aggression, particularly directed at Sennacherib of Assyria.
The book of James develops the bridle as the primary metaphor for tongue-control: “If we put bits into the mouths of horses so that they obey us, we guide their whole bodies as well. So also the tongue is a small member, yet it boasts of great things” (James 3:3). The comparison between the small bit that controls the large horse and the small tongue that directs the whole person became one of the most influential metaphors for self-governance in the biblical tradition. Isaiah 30:28 applies the bridle of divine discipline to the nations.