Solomon
Proverbs 26:3ESV·traditional attribution

A whip for the horse, a bridle for the donkey, and a rod for the back of fools.

Matthew Henry Presbyterian @wholebiblehenry

Here, 1. Wicked men are compared to the horse and the ass, so brutish are they, so unreasonable, so unruly, and not to be governed but by force or fear, so low has sin sunk men, so much below themselves.

John Gill Reformed Baptist @doctorgill

A whip for the horse,.... One that is dull of going, or refractory and wants breaking; a bridle for the ass; not to curb and restrain it from going too fist, asses being generally dull; but to direct its way and turn it when necessary, it being stiffnecked and obstinate; though the Septuagint, Syriac, and Arabic versions, render it a "spear" or "goad", something to...

Jamieson-Fausset-Brown Reformed @jfbcommentary

The rod is as much needed by fools and as well suited to them, as whips and bridles are for beasts.