Numbers 8:24-26

NSB^{(i) 24} »From the age of twenty-five each Levite shall perform his duties in the tent of my presence, ²⁵ »They must retire from active service when they are fifty years old. ²⁶ »They may assist the other Levites in their duties at the tent of meeting. But they may not do any regular work. This is how you will handle the Levites’ duties.«