Why is the priesthood of Aaron significant?

Aaron's role as the high priest in the Old Testament is significant because it foreshadows Christ's priestly ministry. Aaron mediated between God and the Israelites, offering sacrifices for their sins. This system was pointing ahead to Jesus Christ, who, as our High Priest, offered Himself as the ultimate sacrifice for sin, fulfilling and surpassing the old covenant. In Hebrews 7:23-28, we learn that Jesus' priesthood is eternal, unlike Aaron's, and that He perfectly intercedes for His people.