Numbers 19:18-21

19:18 Then a ceremonially clean person must take hyssop, dip it in the water, and sprinkle it on the tent, on all its furnishings, and on the people who were there, or on the one who touched a bone, or one killed, or one who died, or a grave. 19:19 And the clean person must sprinkle the unclean on the third day and on the seventh day; and on the seventh day he must purify him, ¹  and then he must wash his clothes, and bathe in water, and he will be clean in the evening. 19:20 But the man who is unclean and does not purify himself, that person must be cut off from among the community, because he has polluted the sanctuary of the Lord; the water of purification was not sprinkled on him, so he is unclean.

19:21 “‘So this will be a perpetual ordinance for them: The one who sprinkles ²  the water of purification must wash his clothes, and the one who touches the water of purification will be unclean until evening. ³ 

[19:19]  ¹ tn The construction uses a simple Piel of חָטָא (khata’, “to purify”) with a pronominal suffix – “he shall purify him.” Some commentators take this to mean that after he sprinkles the unclean then he must purify himself. But that would not be the most natural way to read this form.

[19:21]  ² tn The form has the conjunction with it: וּמַזֵּה (umazzeh). The conjunction subordinates the following as the special law. It could literally be translated “and this shall be…that the one who sprinkles.”

[19:21]  ³ sn This gives the indication of the weight of the matter, for “until the evening” is the shortest period of ritual uncleanness in the Law. The problem of contamination had to be taken seriously, but this was a relatively simple matter to deal with – if one were willing to obey the Law.