John Gills Exposition of the Bible Commentary - Psalms 51:2
Wash me thoroughly from mine iniquity ,.... Which supposes defilement by sin, and that very great, and such as none can remove but the Lord himself; who, when he takes it in hand, does it effectually and thoroughly; see Ezekiel 36:25 . David's sin had long lain upon him, the faith of it had as it were eaten into him, and spread itself over him, and therefore he needed much washing: "wash me much", all over, and thoroughly: and cleanse me from my sin : which only the blood of Christ can... read more
Matthew Henry's Complete Commentary - Psalms 51:1-6
The title has reference to a very sad story, that of David's fall. But, though he fell, he was not utterly cast down, for God graciously upheld him and raised him up. 1. The sin which, in this psalm, he laments, was the folly and wickedness he committed with his neighbour's wife, a sin not to be spoken of, nor thought of, without detestation. His debauching of Bathsheba was the inlet to all the other sins that followed; it was as the letting forth of water. This sin of David's is recorded for... read more