Bamidbar 3:5-7

Orthodox Jewish Bible

⁵ And Hashem spoke unto Moshe, saying,

⁶ Bring the tribe of Levi near [i.e., present them as offerings are presented], and present them before Aharon HaKohen, that they may minister unto him [i.e., help, be of service to him].

⁷ And they [the Levi’im] shall be shomer mishmeret (watch the watch, keep the guard duty) for him and for the mishmeret kol HaEdah (duty of the whole Congregation) before the Ohel Mo’ed, to do avodat HaMishkan (the work, service of the Mishkan).