Bamidbar 8:18-20

Orthodox Jewish Bible

¹⁸ And I have taken the Levi’im tachat (instead of) Kol Bechor Bnei Yisroel.

¹⁹ And I have given the Levi’im as a gift to Aharon and to his Banim from among the Bnei Yisroel, to do the Avodat Bnei Yisroel in the Ohel Mo’ed, and to make kapporah for the Bnei Yisroel; so that there be no plague among the Bnei Yisroel, when the Bnei Yisroel come near unto HaKodesh.

²⁰ And Moshe, and Aharon, and Kol Adat Bnei Yisroel, did with the Levi’im according unto all that Hashem commanded Moshe concerning the Levi’im, so did the Bnei Yisroel unto them.