Exodus 29:10

And thou shalt cause a bullock, &c.— It would be more properly rendered the bullock, as it was mentioned in the 1st verse, and there called a young bullock. This was a sin-offering for the priest, Exodus 29:14 who needed to offer up sacrifice, as well for his own as for the sins of the people; Hebrews 7:27. All the sin-offerings of the high-priest were bullocks; Leviticus 4:3. And, in confession of sin, as laying it upon this typical sacrifice, Aaron and his sons were to put their hands upon the head of the bullock; compare Leviticus 16:21 a form afterwards enjoined as general: and there can be no question, I suppose, that the blood of bulls and of goats could not take away sin; so all this had reference to the great expiation made by the blood of that sacrifice, which is sufficient to take away the sins of the whole world.