Augustine of Hippo

You see, those old sacrifices of the people of God also represented in a variety of ways this single one that was to come. Christ himself, I mean, was both a sheep, because of his innocence and simplicity of soul, and a goat because of "the likeness of sinful flesh." And whatever else was foretold "in many and various ways" in the sacrifices of the old covenant refers to this single one which has been revealed in the new covenant.