Hebrews 7:24-25

7:24 but he holds his priesthood permanently since he lives forever. 7:25 So he is able to save completely those who come to God through him, because he always lives to intercede for them.

Hebrews 7:28

7:28 For the law appoints as high priests men subject to weakness, ¹  but the word of solemn affirmation that came after the law appoints a son made perfect forever.

[7:28]  ¹ sn See Heb 5:2 where this concept was introduced.