'Priest Forever' in the Bible

For he says in another passage, "You are a priest forever of the priesthood of Melchizedek."

to whom Abraham apportioned one tenth of all the spoil, who is first, as his name shows, king of righteousness and then king of Salem, which means king of peace??3 with no father or mother or ancestry, and with no beginning to his days nor end to his life, but like no one but the Son of God, continues as priest forever.

For the psalm bears witness, "You are a priest forever, of the priesthood of Melchizedek!"

for God took no oath in appointing the old priests, but he made oath to his appointment, when he said to him, "The Lord has sworn it and he will not change; You are a priest forever!"

For the Law appoints to the high priesthood men full of imperfection; but this utterance about the making of the oath, which came long after the Law, appoints a son, fully qualified to be high priest forever.