Leviticus 9:22 - Wesley's Explanatory Notes

Aaron lifted up his hands — Which was the usual rite of blessing. By this posture he signified both whence he expected the blessing, and his hearty desire of it for them. And blessed them — In some such manner, as is related, Numbers 6:24, &c. though not in the same form, for it is not probable that he used it before God delivered it And this blessing was an act of his priestly office, no less than sacrificing. And herein be was a type of Christ, who came into the world to bless us, and when he was parting from his disciples, lifted up his hands and blessed them: yea, and in them his whole church, of which they were the elders and representatives. And came down — From the altar; whence he is said to come down, either Because the altar stood upon raised ground, or Because it was nearer the holy place, which was the upper end.