Hebrews 7:3

7:3 Without father, without mother, without genealogy, he has neither beginning of days nor end of life but is like the son of God, and he remains a priest for all time.

Hebrews 7:8

7:8 and in one case tithes are received by mortal men, while in the other by him who is affirmed to be alive.

Hebrews 7:23-25

7:23 And the others who became priests were numerous, because death prevented them from continuing in office, 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.