Numbers 8:22-24

American Standard Version

²² And after that went the Levites in to do their service in the tent of meeting before Aaron, and before his sons: as Jehovah had commanded Moses concerning the Levites, so did they unto them.

²³ And Jehovah spake unto Moses, saying, ²⁴ This is that which belongeth unto the Levites: from twenty and five years old and upward they shall go in ^[a]to wait upon the service in the work of the tent of meeting: