and sacrifice all the first-born of its cattle to Him. But now the Levites and their cattle were to be adopted in their place, and the first-born sons of Israel to be released in return (Num 3:40.). By this arrangement, through which the care of the service at the sanctuary was transferred to one tribe, which would and should henceforth devote itself with undivided interest to this vocation, not only was a more orderly performance of this service secured, than could have been effected through the first-born of all the tribes; but so far as the whole nation was concerned, the fulfilment of its obligations in relation to this service was undoubtedly facilitated. Moreover, the Levites had proved themselves to be the most suitable of all the tribes for his post, through their firm and faithful defence of the honour of the Lord at the worship of the golden calf (Exo 32:26.). It is in this spirit, which distinguished the tribe of Levi, that we may undoubtedly discover the reason why they were chosen by God for the service of the sanctuary, and not in the fact that Moses and Aaron belonged to the tribe, and desired to form a hierarchical caste of the members of their own tribe, such as was to be found among other nations: the magi, for example, among the Medes, the Chaldeans among the Persians, and the Brahmins among the Indians. יהוה אני לי, “to Me, to Me, Jehovah” (Num 3:13, Num 3:41, and Num 3:45; cf. Ges. §121, 3).
verses 14-20
The muster of the Levites included all the males from a month old and upwards, because they were to be sanctified to Jehovah in the place of the first-born; and it was at the age of a month that the latter were either to be given up or redeemed (comp. Num 3:40 and Num 3:43 with Num 18:16). In Num 3:17-20 the sons of Levi and their sons are enumerated, who were the founders of the mishpachoth among the Levites, as in Exo 6:16-19.
verses 21-26
The Gershonites were divided into two families, containing 7500 males. They were to encamp under their chief Eliasaph, behind the tabernacle, i.e., on the western side (Num 3:23, Num 3:24), and were to take charge of the dwelling-place and the tent, the covering, the curtain at the entrance, the hangings round the court with the curtains at the door, and the cords of the tent, “in relation to all the service thereof” (Num 3:25.); that is to say, according to the more precise injunctions in Num 4:25-27, they were to carry the tapestry of the dwelling (the inner covering, Exo 26:1.), and of the tent (i.e., the covering made of goats' hair, Exo 26:7.), the covering thereof (i.e., the covering of rams' skins dyed red, and the covering of sea-cow skin upon the top of
