An earlier question asks about the first animal sacrifice. The two top answers both suggest that God instituted animal sacrifice by example when He killed an animal to provide Adam and Eve with clothing in Gen 3:21. It is easy to find that opinion in sermons or statements about Christian doctrine, but I wondered if the animal skins were regarded as sacrificial in the early church?
What is the earliest statement that the clothing in Gen 3:21 represent a sacrifice? I would hope to find an answer within the first few centuries of Christianity, but if not then the earliest teaching of any Christian leader is fair game.