Exodus 29:23

One loaf of bread. For the “loaf,” the “cake,” the “wafer,” and the “basket” see vs. 2, 3. Placing these offerings in the hands of Aaron and his sons, Moses was to take their hands in his and “wave” them in a swinging motion forward, probably to show that the offering belonged to God, and backward, to indicate that it was accepted by God and returned, so to speak, with His blessing. This was the act of consecration by which the actual installation in office took place. Moses thus transferred to his brother, and his brother’s sons, the priestly functions he himself had heretofore exercised. By physically waving their hands he guided them in the performance of their first priestly act.