Psalms 141:5

Here, I. David desires to be told of his faults. His enemies reproached him with that which was false, which he could not but complain of; yet, at the same time, he desired his friends would reprove him for that which was really amiss in him, particularly if there was any thing that gave the least colour to those reproaches (Psa 141:5): let the righteous smite me; it shall be a kindness. The righteous God (so some); "I will welcome the rebukes of his providence, and be so far from quarrelling with them that I will receive them as tokens of love and improve them as means of grace, and will pray for those that are the instruments of my trouble." But it is commonly taken for the reproofs given by righteous men; and it best becomes those that are themselves righteous to reprove the unrighteousness of others, and from them reproof will be best taken. But if the reproof be just, though the reprover be not so, we must make a good use of it and learn obedience by it. We are here taught how to receive the reproofs of the righteous and wise. 1. We must desire to be reproved for whatever is amiss in us, or is done amiss by us: "Lord, put it into the heart of the righteous to smite me and reprove me.

— Matthew Henry's Concise Commentary (public domain)