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What’s the difference between the priestly line of Aaron and Melchizedek?

If perfection could have been attained through the Levitical priesthood—and indeed the law given to the people established that priesthood—why was there still need for another priest to come, one in the order of Melchizedek, not in the order of Aaron?  Hebrews 7:11
            Abraham met a priest named Melchizedek in Genesis 14.  Aaron was introduced later in Exodus 4 and made a priest in Exodus 28.  Melchizedek’s priesthood is mysterious, coming out of nowhere.  His position was not established in the Bible like Aaron’s was—he was just introduced as a priest.
            The book of Hebrews makes the case that Jesus, as a priest, was more like Melchizedek than Aaron.  Jesus came from the line of Judah, not Levi, which was the priestly genealogy, so he was not from the earthly line of Aaron.
 For it is clear that our Lord descended from Judah, and in regard to that tribe Moses said nothing about priests. And what we have said is even more clear if another priest like Melchizedek appears, one who has become a priest not on the basis of a regulation as to his ancestry but on the basis of the power of an indestructible life. Hebrews 7:14-16
            Aaron’s priestly descendants came from an earthly line of descendants.  Melchizedek, mysteriously, comes from no earthly line, making him more of a “godly” figure.  The priesthood of Melchizedek is more aligned with Jesus who is our high priest, but did not get that title through a blood line.  He just is.
The Lord has sworn and will not change his mind: “You are a priest forever, in the order of Melchizedek.”  Psalm 110:4
            Psalm 110 calls the order or line of Melchizedek a “forever” line or permanent priesthood—one only God could have (Hebrews 7:24).  While many literally come from the line of Aaron, only one figurately came from the line of Melchizedek.