Commentaire sur Les Nombres 8:19

ואתנה וגו׳ AND I HAVE GIVEN [THE LEVITES etc.] — Five times are the “children of Israel” mentioned in this verse (where the last four times they might have been alluded to by a personal pronoun), in order to show what affection they are held by the Lord in that the mention of them is repeated five times in one verse corresponding in number to the “Five Books of the Torah”. Thus I have seen stated in Genesis Rabbah (Leviticus Rabbah 2:4; cf. Genesis Rabbah 3:5).

ואתנה את הלוים, since they are by themselves “given” to perform service for Me, they are now at the disposal of Aaron and his sons, My delegates on earth.

ואתנה את הלוים נתנים לאהרון ולבניו, "and I have given the Levites,-they are given to Aaron and his sons, etc;" why did the Torah repeat the word נתנים, "they are given?" This may be intended to obligate the recipient of a gift to accept that gift and not to refuse it. Although in matters of inter-personal relationships it is perfectly in order for a person to decline to accept a gift as long as it has not come into his possession (his hands) and he has thereby acquired it, in this instance the Torah obligates the priests to accept this gift although acceptance involves negative aspects. By accepting the new status of the Levites -even though they were subordinate to the priests- the kind of duties performed by the priests became forbidden to the priests on pain of death. This is the view of Sifri on Numbers 18,3. The wording there is: "both they and you will be subject to the death penalty; you when you interfere in matters allocated to them and they when they interfere in matters allocated to you." This contrasts somewhat with what Maimonides wrote in chapter 3 of Hilchot Kley Hamikdosh where he describes Levites who performed service in the Temple, i.e. the domain of the priests, as guilty of death at the hands of Heaven. However, he describes priests who perform tasks allocated to the Levites as guilty of transgressing only an ordinary negative commandment, and not guilty of death. At any rate, Maimonides also agrees that such a transgression on the part of the priests qualifies for some retribution. Considering this we could understand why the priests would decline the gift of the Levites. The Torah therefore had good reason to repeat the word נתנים to deny the priests the option to decline this gift.