A passage in Exodus (xiii. 11 f.) must not be overlooked in connection with that presently under consideration. The enactment there is to the effect that when Israel is brought into the land of the Canaanites every first-born of beasts shall be set apart unto the Lord, the firstling of an ass shall be redeemed with a lamb or killed, and all first-born children shall be redeemed. Here the singular point is that the law is deferred, and does not come into operation till the settlement in Canaan. Either this was set aside for the provisions made in Numbers, or these are to be interpreted by it. The difficulties of the former view are greatly increased by the mention of the "shekel of the sanctuary," which seems to imply a settled medium of exchange, hardly possible in the wilderness.
In Numb. viii. 18, 19, the subject of redemption is again touched, and the additions are significant. Now the service of the Levites "in the tent of meeting" is by way of atonement for the children of Israel, "that there be no plague among the children of Israel when the children of Israel come nigh unto the sanctuary." Atonement is not with blood in this case, but by the service of the living substitute. While the general scope of the Mosaic law requires the shedding of blood in order that the claim of God may be met, this exception must not be forgotten. And in a sense it is the chief instance of atonement, far transcending in expressiveness those in which animals were slaughtered for propitiation. The whole congregation, threatened with plagues and disasters in approaching God, has protection through the holy service of the Levitical tribe. Here is substitution of a kind which makes a striking point in the symbolism of the Old Testament in its relation to the New. The principle may be seen in patriarchal history. The ten in Sodom, if ten righteous men could have been found, would have saved it, would have been its atonement in a sense, not by their death on its behalf but by their life. And Moses himself, standing alone between God and Israel, prevails by his pleading and saves the nation from its doom. So our Lord says of His disciples, "Ye are the salt of the earth." Their holy devotion preserves the mass from moral corruption and spiritual death. Again, "for the elect's sake," the days of tribulation shall be shortened (Matt. xxiv. 22).
The ceremonies appointed for the cleansing and consecration of the Levites, described in viii. 5-26, may be noticed here. They differed considerably from those enjoined for the consecration of priests. Neither were the Levites anointed with sacred oil, for instance, nor were they sprinkled with the blood of sacrifices; nor, again, do they seem to have worn any special dress, even in the tabernacle court. There was, however, an impressive ritual which would produce in their minds a consciousness of separation and devotion to God. The water of expiation, literally of _sin_, was first to be sprinkled upon them, a baptism not signifying anything like regeneration, but having reference to possible defilements of the flesh. A razor was then to be made to pass over the whole body, and the clothes were to be washed, also to remove actual as well as legal impurity. This cleansing completed, the sacrifices followed. One bullock for a burnt offering, with its accompanying meal offering, and one for a sin offering were provided. The people being assembled towards the door of the tent of meeting, the Levites were placed in front of them to be presented to Jehovah. The princes probably laid their hands on the Levites, so declaring them the representatives of all for their special office. Then Aaron had to offer the sacrifices for the Levites, and the Levites themselves as living sacrifices to Jehovah. The Levites laid their hands on the bullocks, making them their substitutes for the symbolic purpose. Aaron and his sons slew the animals and offered them in the appointed way, burning the one bullock upon the altar, around which its blood had been sprinkled, of the other burning only certain portions called the fat. Then the ceremony of waving was performed, or what was possible in the circumstances, each Levite being passed through the hands of Aaron or one of his sons. So set apart, they were, according to viii. 24, required to wait upon the work of the tent of meeting, each from his twenty-fifth to his fiftieth year. The service had been previously ordered to begin at the thirtieth year (iv. 3). Afterwards the time of ministry was still further extended (1 Chron. xxiii. 24-27).