Hebrews 5:4-6 NKJV
And no man takes this honor to himself, but he who is called by God, just as Aaron was.
So also Christ did not glorify Himself to become High Priest, but it was He who said to Him:
“You are My Son,
Today I have begotten You.”
As He also says in another place:
“You are a priest forever
According to the order of Melchizedek”
NKJV: New King James Version