Numbers 8

14. and the Levites shall be mine--that is, exempt from all military duty or secular work--free from all pecuniary imposition and wholly devoted to the custody and service of the sanctuary.

15. after that, shall the Levites go in to do the service of the tabernacle of the congregation--into the court, to assist the priests; and at removal into the tabernacle--that is, into the door of it--to receive the covered furniture.

19. to make an atonement for the children of Israel, &c.--to aid the priests in that expiatory work; or, as the words may be rendered, "to make redemption for" the Levites being exchanged or substituted for the first-born for this important end, that there might be a sanctified body of men appointed to guard the sanctuary, and the people not allowed to approach or presumptuously meddle with holy things, which would expose them to the angry judgments of Heaven.

24. from twenty and five years old, &c.--(Compare Numbers 4:3 ). They entered on their work in their twenty-fifth year, as pupils and probationers, under the superintendence and direction of their senior brethren; and at thirty they were admitted to the full discharge of their official functions.

25. 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.

26. But shall minister with their brethren--in the performance of easier and higher duties, instructing and directing the young, or superintending important trusts. "They also serve who only wait" [MILTON].