What does the Bible say about the priestly office of Christ?

In Hebrews 4:15, Christ is presented as a High Priest who is 'touched with the feeling of our infirmities' and was tempted in all points, yet without sin. Unlike the Aaronic priests, who were sinful and had to offer sacrifices for their own sins, Christ's priesthood is sinless. He embodies the perfect fulfillment of the priestly role, characterized by His sinlessness, His suffering in the human experience, and His deep sympathy towards His people. This makes Him a perfect mediator who understands our trials and is ever ready to aid us in our needs.