Numbers 8:22-24

Modern English Version

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.