22. And after that went the Levites in to do their service in the tabernacle of meeting before Aaron, and before his sons: as the LORD had commanded Moses concerning the Levites, so did they unto them.
23. And the LORD spoke unto Moses, saying,
24. This is what pertains to the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of meeting:
25. And from the age of fifty years they shall cease waiting upon the service thereof, and shall serve no more: