verses 5-7
The priest was to have one of the birds killed into an earthen vessel upon fresh water (water drawn from a fountain or brook, Lev 15:13; Gen 26:19), that is to say, slain in such a manner that its blood should flow into the fresh water which was in a vessel, and should mix with it. He was then to take the (other) live bird, together with the cedar-wood, scarlet, and hyssop, and dip them (these accompaniments) along with the bird into the blood of the one which had been killed over the water. With this the person cured of leprosy was to be sprinkled seven times (see Lev 4:6) and purified; after which the living bird was to be “let loose upon the face of the field,” i.e., to be allowed to fly away into the open country. The two birds were symbols of the person to be cleansed. The one let loose into the open country is regarded by all the commentators as a symbolical representation of the fact, that the former leper was now imbued with new vital energy, and released from the fetters of his disease, and could now return in liberty again into the fellowship of his countrymen. But if this is established, the other must also be a symbol of the leper; and just as in the second the essential point in the symbol was its escape to the open country, in the first the main point must have been its death. Not, however, in this sense, that it was a figurative representation of the previous condition of the leper; but that, although it was no true sacrifice, since there was no sprinkling of blood in connection with it, its bloody death was intended to show that the leper would necessarily have suffered death on account of his uncleanness, which reached to the very foundation of his life, if the mercy of God had not delivered him from this punishment of sin, and restored to him the full power and vigour of life again. The restitution of this full and vigorous life was secured to him symbolically, by his being sprinkled with the blood of the bird which was killed in is stead. But because his liability to death had assumed a bodily form in the uncleanness of leprosy, he was sprinkled not only with blood, but with the flowing water of purification into which the blood had flowed, and was thus purified from his mortal uncleanness. Whereas one of the birds, however, had to lay down its life, and shed its blood for the person to be cleansed, the other was made into a symbol of the person to be cleansed by being bathed in the mixture of blood and water; and its
