22 Only then did they enter upon their service in the tent of meeting under the supervision of Aaron and his sons. Exactly as the Lord had commanded Moses concerning the Levites, so it was done with regard to them.
23 The Lord said to Moses:
24 This is the rule for the Levites. Everyone twenty-five years old or more shall join the personnel in the service of the tent of meeting.
25 But everyone fifty on up shall retire from the work force and serve no more.
26 They shall assist their fellow Levites in the tent of meeting in performing their duties, but they shall not do the work. This, then, is how you are to regulate the duties of the Levites.