Christ was Designated by God to be High Priest (Hebrews 5:4-10) NLT

4    And no one can become a high priest simply because he wants such an honor. He must be called by God for this work, just as Aaron was.
5    That is why Christ did not honor himself by assuming he could become High Priest. No, he was chosen by God, who said to him, “You are my Son.  Today I have become your Father.”

6    And in another passage God said to him, “You are a priest forever in the order of Melchizedek.”

7    While Jesus was here on earth, he offered prayers and pleadings, with a loud cry and tears, to the one who could rescue him from death. And God heard his prayers because of his deep reverence for God. 

8    Even though Jesus was God’s Son, he learned obedience from the things he suffered. 

9    In this way, God qualified him as a perfect High Priest, and he became the source of eternal salvation for all those who obey him. 

10  And God designated him to be a High Priest in the order of Melchizedek.