Numbers 8:23-26

American Standard Version

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: ²⁵ and from the age of fifty years they shall ^[b]cease waiting upon the work, and shall serve no more, ²⁶ but shall minister with their brethren in the tent of meeting, to keep the charge, and shall do no service. Thus shalt thou do unto the Levites touching their charges.