John Wesley on Leviticus 4:12

The whole bullock - So no part of this was to be eaten by the priests, as it was in other sin - offerings. The reason is plain, because the offerer might not eat of his own sin - offering, and the priest was the offerer in this case, as also in the sin - offering for the whole congregation below, of which the priest himself was a member. Shall be carried forth - Not himself, which would have defiled him, but by another whom he shall appoint for that work. Without the camp - To signify either, The abominable nature of sin, especially in high and holy persons, or when it overspreads a whole people. Or, The removing of the guilt or punishment of that sin from the people. Or, That Christ should suffer without the camp or gate. Where the ashes are - For the ashes, though at first they were thrown down near the altar, Lev 1:16, yet afterwards they, together with the filth of the sacrifices, were carried into a certain place without the camp.