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How do we know that Christ's priesthood was necessary?

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Christ's priesthood was necessary because only by becoming man could He offer a valid sacrifice for sin (Hebrews 8:3).

For Christ to play the role of our High Priest, it was essential that He became man. This is grounded in the need for a sacrifice; without His incarnation, He would have had no body to offer as a sacrifice for sin (Hebrews 8:3). Other roles such as Prophet and King did not necessitate His becoming human, but the role of Priest did. If He had remained only divine, His priesthood would have been meaningless, likened to a king without subjects or a priest devoid of sacrifices. Through His humanity, He offers a valid atonement that fulfills God's requirements for justice and mercy.
Scripture References: Hebrews 8:3

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