Numbers 8:23-26 - Retirement Of The Levites
23 Yahweh spoke to Moses, saying, 24 "This [is] what is for the Levites: {those twenty-five years old} and above will come to help [with the] service in the work of the tent of assembly; 25 and {those fifty years old} will return from the service of the work and will serve no longer. 26 They can attend their brothers in the tent of assembly to keep [their] responsibilities, but they will not do work. This is what you will do concerning the Levities and their responsibilities."