Proverbs 26:11 (BSB)

As a dog returns to its vomit, so a fool repeats his folly.

From Proverbs 26. Also in the ESV.

Commentary on Proverbs 26:11

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Proverbs 26:11: See here, 1. What an abominable thing sin is, and how hateful sometimes it is made to appear, even to the sinner himself. When his conscience is convinced, or he feels smart from his sin, he is sick of it, and vomits it up; he seems then to detest it and to be willing to part with it.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Proverbs 26:11: As a dog returneth to his vomit,.... Who being sick with what he has eaten, casts it up again, and afterwards returns unto it and licks it up; so a fool returneth to his folly, or "repeats" (a) it, time after time, many times, as Ben Melech; or a wicked man turns to his wickedness, who, having had some qualms upon his conscience for sin...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Proverbs 26:11: returneth . . . folly--Though disgusting to others, the fool delights in his folly.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Proverbs 26:11: Pro 26:11 The series of proverbs regarding fools is continued: Like a dog which returneth to his vomit, Is a fool who cometh again with his folly. שׁב is like שׁונה, particip.; only if the punctuation were כּכּלב, ought “which returneth to his vomit” to be taken as a relative clause (vid., under Psa 38:14). Regarding על as designating the terminus quo with verbs of motions, vid., Köhler under Mal.