Hebrews 5:3-5

New Catholic Bible

³And as a result of this, he must make sin offerings for himself as well as for the people. ⁴Moreover, one does not assume this position of honor on his own initiative, but only when called by God, just as Aaron was.

⁵Even Christ did not confer upon himself the glory of becoming a high priest. Rather, he was appointed by the one who said to him:

“You are my Son;
this day I have begotten you.”