With hyssop; or, as with hyssop; the note of similitude being frequently understood. As lepers and other unclean persons are by thy appointment purified by the use of hyssop and other things, Leviticus 14:6 Numbers 19:6; so do thou cleanse me, a most leprous and polluted creature, by thy grace, and by the virtue of that blood of Christ, which is signified by those ceremonial usages.
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.