Proverbs 26:3

3 A whip for the horse, a bridle for the ass, And a rod for the back of fools. J. D. Michaelis supposes that the order should be reversed: a bridle for the horse, a whip for the ass; but Arnoldi has here discovered the figure of speech merismus (cf. Pro 10:1); and Hitzig, in the manner of the division, the rhythmical reason of the combination (cf. שׁם חם ויפת for שׁם יפת וחם): whip and bridle belong to both, for one whips a horse (Neh 3:2) and also bridles him; one bridles an ass (Psa 32:9) and also whips him (Num 22:28.). As whip and bridle are both serviceable and necessary, so also serviceable and necessary is a rod, לגו כּסילים, Pro 10:13; Pro 19:29.

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. Man indeed is born like the wild ass's colt, but as some by the grace of God are changed, and become rational, so others by custom in sin are hardened, and become more and more sottish, as the horse and the mule, Psa 32:9. 2. Direction is given to use them accordingly. Princes, instead of giving honour to a fool (Pro 26:1), must put disgrace upon him - instead of putting power into his hand, must exercise power over him. A horse unbroken needs a whip for correction, and an ass a bridle for direction and to check him when he would turn out of the way; so a vicious man, who will not be under the guidance and restraint of religion and reason, ought to be whipped and bridled, to be rebuked severely, and made to smart for what he has done amiss, and to be restrained from offending any more.

26:3 A fool is like a dumb animal that can only be guided by brute force (see 10:13; 14:3).