Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary

The blood was divided into two parts. One half was swung by Moses upon the altar (זרק to swing, shake, or pour out of the vessel, in distinction from הזּה to sprinkle) the other half he put into basins, and after he had read the book of the covenant to the people, and they had promised to do and follow all the words of Jehovah, he sprinkled it upon the people with these words: "Behold the blood of the covenant, which Jehovah has made with you over all these words." As several animals were slaughtered, and all of them young oxen, there must have been a considerable quantity of blood obtained, so that the one half would fill several basins, and many persons might be sprinkled with it as it was being swung about. The division of the blood had reference to the two parties to the covenant, who were to be brought by the covenant into a living unity; but it had no connection whatever with the heathen customs adduced by Bhr and Knobel, in which the parties to a treaty mixed their own blood together. For this was not a mixture of different kinds of blood, but it was a division of one blood, and that sacrificial blood, in which animal life was offered instead of human life, making expiation as a pure life for sinful man, and by virtue of this expiation restoring the fellowship between God and man which had been destroyed by sin. But the sacrificial blood itself only acquired this signification through the sprinkling or swinging upon the altar, by virtue of which the human soul was received, in the soul of the animal sacrificed for man, into the fellowship of the divine grace manifested upon the altar, in order that, through the power of this sin-forgiving and sin-destroying grace, it might be sanctified to a new and holy life. In this way the sacrificial blood acquired the signification of a vital principle endued with the power of divine grace; and this was communicated to the people by means of the sprinkling of the blood. As the only reason for dividing the sacrificial blood into two parts was, that the blood sprinkled upon the altar could not be taken off again and sprinkled upon the people; the two halves of the blood are to be regarded as one blood, which was first of all sprinkled upon the altar, and then upon the people. In the blood sprinkled upon the altar, the natural life of the people was given up to God, as a life that had passed through death, to be pervaded by His grace; and then through the sprinkling upon the people it was restored to them again, as a life renewed by the grace of God. In this way the blood not only became a bond of union between Jehovah and His people, but as the blood of the covenant, it became a vital power, holy and divine, uniting Israel and its God; and the sprinkling of the people with this blood was an actual renewal of life, a transposition of Israel into the kingdom of God, in which it was filled with the powers of God's spirit of grace, and sanctified into a kingdom of priests, a holy nation of Jehovah (Exo 19:6). And this covenant was made "upon all the words" which Jehovah had spoken, and the people had promised to observe. Consequently it had for its foundation the divine law and right, as the rule of life for Israel.