The former regulation is set aside because it was weak and useless
References for Hebrews 7:18
(for the law made nothing perfect), and a better hope is introduced, by which we draw near to God.
References for Hebrews 7:19
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.’ ”
References for Hebrews 7:21
Because of this oath, Jesus has become the guarantor of a better covenant.
References for Hebrews 7:22
Now there have been many of those priests, since death prevented them from continuing in office;
but because Jesus lives forever, he has a permanent priesthood.
References for Hebrews 7:24
Therefore he is able to save completely those who come to God through him, because he always lives to intercede for them.
References for Hebrews 7:25
Such a high priest truly meets our need—one who is holy, blameless, pure, set apart from sinners, exalted above the heavens.
References for Hebrews 7:26
Unlike the other high priests, he does not need to offer sacrifices day after day, first for his own sins, and then for the sins of the people. He sacrificed for their sins once for all when he offered himself.
References for Hebrews 7:27
For the law appoints as high priests men in all their weakness; but the oath, which came after the law, appointed the Son, who has been made perfect forever.
References for Hebrews 7:28