(19) He shall purify himself, and wash . . . --The rendering should be, he (i.e., the clean person) shall purify him (i.e., the unclean person), and he (the unclean person) shall wash . . .

Verse 19. - On the third day, and on the seventh day. The twice-repeated application of holy water marked the clinging nature of the pollution to be removed; so also the repetition of the threat in the following verse marked the heinousness of the neglect to seek its removal.

19:11-22 Why did the law make a corpse a defiling thing? Because death is the wages of sin, which entered into the world by it, and reigns by the power of it. The law could not conquer death, nor abolish it, as the gospel does, by bringing life and immortality to light, and so introducing a better hope. As the ashes of the heifer signified the merit of Christ, so the running water signified the power and grace of the blessed Spirit, who is compared to rivers of living water; and it is by his work that the righteousness of Christ is applied to us for our cleansing. Those who promise themselves benefit by the righteousness of Christ, while they submit not to the grace and influence of the Holy Spirit, do but deceive themselves; we cannot be purified by the ashes, otherwise than in the running water. What use could there be in these appointments, if they do not refer to the doctrines concerning the sacrifice of Christ? But comparing them with the New Testament, the knowledge to be got from them is evident. The true state of fallen man is shown in these institutions. Here we learn the defiling nature of sin, and are warned to avoid evil communications.And the clean person shall sprinkle upon the unclean,.... The clean priest shall sprinkle upon the unclean man, as the Targum of Jonathan; that is, he shall sprinkle the water of purification upon him that is unclean in any of the above ways:

on the third day, and on the seventh day; See Gill on Numbers 19:12,

and on the seventh day he shall purify himself; either the unclean person, who shall perfect his purification, as Jarchi interprets it, that is, by doing what follows; or else the clean person, who becomes in some measure unclean, by sprinkling and touching the water of separation, as appears from Numbers 19:21 as the priest that sprinkled the blood of the heifer, and the man that burnt it and gathered its ashes, Numbers 19:7.

and wash his clothes, and bathe himself in water, and shall be clean at even; in like manner as the man that let go the goat into the wilderness, Leviticus 16:26.