from thirty years old and upward until fifty years old thou shall number them, all who enter in to wait upon the service, to do the work in the tent of meeting.
This is that which belongs to the Levites: From twenty-five years old and upward they shall go in to wait upon the service in the work of the tent of meeting.
but shall minister with their brothers in the tent of meeting, to keep the charge, and shall do no service. Thus shall thou do to the Levites concerning their charges.