By what authority did Jesus replace the Levitical Priesthood?

By what authority did Jesus replace the Levitical priesthood with the Melchizedek priesthood? He is the Word of God, which gives Him all authority, but He always exercises that authority within the bounds of Scriptural laws and prophesy. In this video we explore how this change in priesthood took place, paving the way for an end to the longstanding temple practice of animal sacrifice.