22 After this, the Levites worked at the sacred tent as assistants to Aaron and his sons, just as the Lord had commanded.
23 The Lord also told Moses,
24-25 “Levites who are between the ages of twenty-five and fifty can work at my sacred tent. But once they turn fifty, they must retire.
26 They may help the other Levites in their duties, but they must no longer be responsible for any work themselves. Remember this when you assign their duties.”