Purge me. Thou wilt sin-cleanse me, or un-sin me: i.e. expiate by the blood of. sin offering.
hyssop. Put by Figure of speech Metonymy (of Cause), for the atoning blood sprinkled by it. Compare Numbers 14:18; Numbers 19:6; Numbers 19:18.
Related Commentaries of Psalms 51:7
Psalms 51:7
7 Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.