Hebrews 5:4-5
Also, it is an office which no one elects to take for himself; he is called to it by God, just as Aaron was.
Hebrews 5:10
being designated by God high priest with the rank of Melchizedek.
Hebrews 7:11-14
Further, if the Levitical priesthood had been the means of reaching perfection (for it was on the basis of that priesthood that the Law was enacted for the People), why was it still necessary for another sort of priest to emerge with the rank of Melchizedek, instead of simply with the rank of Aaron
Hebrews 7:23-28
Also, while they became priests in large numbers, since death prevents them from continuing to serve,