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The seventh book of Numbers talks about the offerings made by the tribes of Israel to God in the sanctuary while the eighth book of Numbers talks about the consecration of the Levites, as well as their service. In Numbers 8:23-26, it is written:
“The Lord said to Moses, “This applies to the Levites: Men twenty-five years old or more shall come to take part in the work at the tent of meeting, but at the age of fifty, they must retire from their regular service and work no longer. They may assist their brothers in performing their duties at the tent of meeting, but they themselves must not do the work. This, then, is how you are to assign the responsibilities of the Levites.”
The passage above states that God requires men who are at least twenty five years old to work. However, when they reach fifty, they are not to do work, but are permitted to assist the others. God ordered that men retire when they come of age because He understands that their bodies will grow weaker, and they may not be able to perform as well. The physical strain of labor may also cause illness or injury to the elderly.