Bamidbar 18:5-7

Orthodox Jewish Bible

⁵ And ye shall stand guard of HaKodesh, and stand guard of the Mizbe’ach; that there be no Ketzef (Wrath) any more upon the Bnei Yisroel.

⁶ And I, hinei, I Myself have taken your brethren the Levi’im from among the Bnei Yisroel; to you they are given as a mattanah (gift) to Hashem, to do the Avodat Ohel Mo’ed [see Ep 4:11].

⁷ Therefore thou and thy Banim with thee shall be shomer over your Kehunah with everything of the Mizbe’ach, and within the Parochet; and ye shall do the Avodas service: I have given your Kehunah unto you as an Avodas Mattanah; and the zar (unauthorized one) that shall encroach shall be put to death.