Hebrews 5:6
Just as elsewhere he says, Thou art a priest for ever, with the rank of Melchizedek.
Hebrews 7:17
for the witness to him is, Thou art priest for ever, with the rank of Melchizedek.
Hebrews 7:21
Previous priests became priests apart from any oath, but he has an oath from Him who said to him, The Lord has sworn, and he will not change his mind, thou art a priest for ever.
Hebrews 7:28
For the Law appoints human beings in their weakness to the priesthood; but the word of the Oath appoints a Son who is made perfect for ever.
Hebrews 6:13-18
For in making a promise to Abraham God swore by himself (since he could swear by none greater),
Hebrews 6:20-3
There Jesus entered for us in advance, when he became high priest for ever with the rank of Melchizedek.
Hebrews 7:11
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