Now viewing scripture range from the book of Numbers chapter 8:22 through chapter 8:25...
22 And after that went the Levites in to do their service in the tabernacle of the congregation before Aaron, and before his sons: as the LORD had commanded Moses concerning the Levites, so did they unto them.
23 And the LORD spake unto Moses, saying,
24 This is it that belongeth unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation:
25 And from the age of fifty years they shall cease waiting upon the service thereof, and shall serve no more: