23 And the Lord said to Moses, 24 This is what applies to the Levites: from twenty-five years old and upward they shall go in to perform the work of the service of the Tent of Meeting, 25 And at the age of fifty years, they shall retire from the warfare of the service and serve no more, 26 But shall help their brethren in the Tent of Meeting [attend to protecting the sacred things from being profaned], but shall do no regular or heavy service. Thus shall you direct the Levites in regard to their duties.