Hebrews 5:4-5

4And besides, one does not appropriate for himself the honor [of being high priest], but he who is called by God, just as Aaron was.

5So too Christ did not glorify Himself so as to be made a high priest, but He [was exalted and appointed by the One] who said to Him, “You are My Son, Today I have begotten (fathered) You [declared Your authority and rule over the nations]”;