For when there is a change of the priesthood, there must also be a change of the law.
He of whom these things are said belonged to a different tribe,1 and no one from that tribe has ever served at the altar.214
For it is clear that our Lord descended from Judah,3 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.
For it is declared: "You are a priest forever, in the order of Melchizedek."a418
The former regulation is set aside because it was weak and useless519
(for the law made nothing perfect),6 and a better hope7 is introduced, by which we draw near to God.820
And it was not without an oath! Others became priests without any oath,
but he became a priest with an oath when God said to him: "The Lord has sworn and will not change his mind:9 'You are a priest forever.' "b1022
Because of this oath, Jesus has become the guarantee of a better covenant.11