And from the age of fifty years they shall withdraw from the duty of the service and serve no more.
We read before of the separating of the Levites from among the children of Israel when they were numbered, and the numbering of them by themselves (Num 3:6, Num 3:15), that they might be employed in the service of the tabernacle. Now here we have directions given for their solemn ordination (Num 8:6), and the performance of it, Num 8:20.
Commenting on Numbers 8:5-26
But shall minister with their brethren in the tabernacle of the congregation,.... By giving advice, instructing younger Levites, and doing lighter service. Jarchi says, they shall return to shutting of doors, singing and loading wagons; but the last especially seems too burdensome: the ministry of such is explained by the next clause: to keep the charge; of the tabernacle, to watch and observe that no...
from the age of fifty years they shall cease waiting upon the service thereof, &c.--that is, on the laborious and exhausting parts of their work.