Leviticus 8:19

“And he killed it, etc.] That is, Moses killed the ram, as the Septuagint version expresses it: and Moses sprinkled the blood upon the altar round about; as he did the blood of the bullock, (<030815>Leviticus 8:15).”

“Moses as the mediator of the covenant of the Law Galatians 3:19; Hebrews 8:6 was called to perform the priestly functions, in consecrating those on whom henceforth those functions were to devolve, and in inaugurating the legal order of sacrifices. See Exodus 40:23 note. The sin-offering was now offered for the first time. The succession in which the sacrifices followed each other on this occasion, first the sin-offering, then the burnt-offering, and lastly the peace-offering, has its ground in the meaning of each sacrifice, and became the established custom in later ages. The worshipper passed through a spiritual process. He had transgressed the Law, and he needed the atonement signified by…”

“He - Either Moses, as in the following clause, or some other person by his appointment; which may be the reason why he is not named here, as he is to the sprinkling of the blood, which was an action more proper to the priest, and more essential to the sacrifice. Leviticus 8:29”