The law chooses high priests who are people with weaknesses, but the word of God’s oath came later than the law. It made God’s Son to be the high priest, and that Son has been made perfect forever.
“ ‘If the appointed priest sins so that he brings guilt on the people, then he must offer a young bull to the Lord, one that has nothing wrong with it, as a sin offering for the sin he has done.
Jesus said to them, “Go tell that fox Herod, ‘Today and tomorrow I am forcing demons out and healing people. Then, on the third day, I will reach my goal.’
God is the One who made all things, and all things are for his glory. He wanted to have many children share his glory, so he made the One who leads people to salvation perfect through suffering.
For this reason Jesus had to be made like his brothers and sisters in every way so he could be their merciful and faithful high priest in service to God. Then Jesus could die in their place to take away their sins.
So also Christ did not choose himself to have the honor of being a high priest, but God chose him. God said to him, “You are my Son. Today I have become your Father.”
No one knows who Melchizedek’s father or mother was, where he came from, when he was born, or when he died. Melchizedek is like the Son of God; he continues being a priest forever.