Bamidbar 4:37-39

Orthodox Jewish Bible

³⁷ These were they that were numbered of the mishpekhot HaKehati, all that might do service in the Ohel Mo’ed which Moshe and Aharon did number according to the command of Hashem by the hand of Moshe.

³⁸ And those that were numbered of the Bnei Gershon, throughout their mishpekhot, and by the bais of their avot,

³⁹ From shloshim shanah and upward even until chamishim shanah shalt thou number them, every one that entereth into the tz’va (holy militia service of Hashem), to do the work of the Avodah in the Ohel Mo’ed,