Hebrews 5:1-6

1Every high priest is selected from among the people and is appointed to represent the people in matters related to God, to offer gifts and sacrifices for sins. 2He is able to deal gently with those who are ignorant and are going astray, since he himself is subject to weakness. 3This is why he has to offer sacrifices for his own sins, as well as for the sins of the people.

4And no one takes this honor on himself, but he receives it when called by God, just as Aaron was.

5In the same way, Christ did not take on himself the glory of becoming a high priest. But God said to him, “You are my Son; today I have become your Father.” Psalm 2:7

6And he says in another place, “You are a priest forever, in the order of Melchizedek.” Psalm 110:4