Hebrews 7:15-22

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.” The former regulation is set aside because it was weak and useless (for the law made nothing perfect), and a better hope is introduced, by which we draw near to God. 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: ‘You are a priest forever.’ ” Because of this oath, Jesus has become the guarantor of a better covenant.