Numbers 8:24-26

Revised Standard Version

²⁴ “This is what pertains to the Levites: from twenty-five years old and upward they shall go in to perform the work in the service of the tent of meeting; ²⁵ and from the age of fifty years they shall withdraw from the work of the service and serve no more, ²⁶ but minister to their brethren in the tent of meeting, to keep the charge, and they shall do no service. Thus shall you do to the Levites in assigning their duties.”