In Context

20 And Moses and Aaron and all the multitude of the children of Israel did with the Levites all that the Lord had commanded Moses:

21 And they were purified, and washed their garments. And Aaron lifted them up in the sight of the Lard, and prayed for them,

22 That being purified they might go into the tabernacle of the covenant to do their services before Aaron and his sons. As the Lord had commanded Moses touching the Levites, so was it done.

23 And the Lord spoke to Moses, saying:

24 This is the law of the Levites: From twenty-five years old and upwards, they shall go in to minister in the tabernacle of the covenant.

25 And when they shall have accomplished the fiftieth year of their age, they shall cease to serve:

Numbers 8:23 in Other Translations