Numbers 8:22-24

New Catholic Bible

²² Then the Levites went in and performed the work of the tent of meeting under the authority of Aaron and his sons. They did to the Levites the things that the Lord had commanded Moses concerning them.

²³ The Lord spoke to Moses, saying, ²⁴ “The Levites will go in to perform the work of the tent of meeting from the age of twenty-five years old.