Numbers 8:22-24

World English Bible

²² After that, the Levites went in to do their service in the Tent of Meeting before Aaron and before his sons: as Yahweh had commanded Moses concerning the Levites, so they did to them.

²³ Yahweh spoke to Moses, saying, ²⁴ “This is what is assigned to the Levites: from twenty-five years old and upward they shall go in to wait on the service in the work of the Tent of Meeting;