Book of Hebrews Commentary Pt 5

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

4 No one takes this honor upon himself; he must be called by God, just as Aaron was. 5 So Christ also did not take upon himself the glory of becoming a high priest. But God said to him, 

     “You are my Son; 

     today I have become your Father.”

6 And he says in another place, 

     “You are a priest forever, 

     in the order of Melchizedek.”

Heb 5:1–6.