Of purifying, Heb. of sin, i.e. for the expiation of sin. This water was mixed with the ashes of a red heifer, Num_19:9, which therefore may seem to have been prescribed before, though it be mentioned after; such kind of transplacings of passages being frequent in Scripture.
Shave all their flesh; which external rite signified the cutting off their inordinate concupiscences of earthly things, and that singular purity of heart and life which is required in the ministers of God. See Isa_52:112Ti_2:21.