Hebrews 7:8-18

8 Here tithes are received by mortal men; there, by one of whom it is testified that he lives.
9 One might even say that Levi himself, who receives tithes, paid tithes through Abraham,
10 for he was still in the loins of his ancestor when Melchiz'edek met him.
11 Now if perfection had been attainable through the Levit'ical priesthood (for under it the people received the law), what further need would there have been for another priest to arise after the order of Melchiz'edek, rather than one named after the order of Aaron?
12 For when there is a change in the priesthood, there is necessarily a change in the law as well.
13 For the one of whom these things are spoken belonged to another tribe, from which no one has ever served at the altar.
14 For it is evident that our Lord was descended from Judah, and in connection with that tribe Moses said nothing about priests.
15 This becomes even more evident when another priest arises in the likeness of Melchiz'edek,
16 who has become a priest, not according to a legal requirement concerning bodily descent but by the power of an indestructible life.
17 For it is witnessed of him, "Thou art a priest for ever, after the order of Melchiz'edek."
18 On the one hand, a former commandment is set aside because of its weakness and uselessness
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.