21
And the Levites purified themselves from sin, and washed their clothes; and Aaron offered them as a wave offering before the LORD, and Aaron made atonement for them to cleanse them.
22
And after that the Levites went in to do their service in the tent of meeting in attendance upon Aaron and his sons; as the LORD had commanded Moses concerning the Levites, so they did to them.
23
And the LORD said to Moses,
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"This is what pertains to the Levites: from twenty-five years old and upward they shall go in to perform the work in the service of the tent of meeting;
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and from the age of fifty years they shall withdraw from the work of the service and serve no more,