21 The Levites cleansed themselves from sin, and they washed their clothes, and Aaron offered them as a wave offering before the Lord, and Aaron made an atonement for them to cleanse them.
22 And after that the Levites went in to do their service in the tent of meeting before Aaron and before his sons. As the Lord had commanded Moses concerning the Levites, so they did to them.
23 The Lord spoke to Moses, saying:
24 This is what belongs to the Levites: From twenty-five years old and older they will go in to do their duty concerning the service of the tent of meeting.
25 And from the age of fifty years they will cease doing their duty concerning its service and will serve no more.
26 But they will minister with their brothers in the tent of meeting, to attend to their needs, but will not do the work. Thus you will do to the Levites concerning their duties.