As there were no priests at that time, the service was performed by the elders of Israel, who in spite of their age performed their duty with youthful vigor. Moses erected an altar on Mount Sinai, as well as twelve memorial pillars, one for each tribe, and then bade them bring bulls, as a burnt offering and a peace offering. The blood of these animals was then separated exactly into two halves. This was attended to by the angel Michael, who guided Moses' hand, and so conducted the separation of the blood that there might be not a drop more in one half than in the other.
God upon this said to Moses: "Sprinkle the one half of the blood upon the people, as a token that they will not barter My glory for the idols of other peoples; and sprinkle the other half on the altar, as a token that I will not exchange them for any other nation." Moses did as he was bidden, and lo! the miracle came to pass that the blood of a few animals sufficed to sprinkle every single Israelite.