Ps 51:7

51:7 with hyssop. The allusion is to Lev. 14:6, 7, where the cleansing of a leper is described.

wash me. This may be an allusion to Num. 19:19, where instructions are given for ritual washing after contact with a dead person. On the need for washing the heart, see “Legalism” at Matt. 23:4.