Albert Barnes Commentary Proverbs 29:24

"Whoso is partner with a thief hateth his own soul; He heareth the adjuration and uttereth nothing." — Proverbs 29:24 (ASV)

On the first discovery of the theft, the person wronged (Judges 17:2), or the judge of the city (marginal reference), pronounced a solemn curse on the thief and on all who, knowing the offender, were unwilling to give evidence against him. The accomplice of the thief hears that curse, and yet is silent, and so falls under it, and destroys his own soul.