I will declare the decree: Jehovah has said unto Me, You are My Son; today I have begotten You.

For to which of the angels did He ever say: You are My Son, today I have begotten You? And again: I will be to Him a Father, and He shall be to Me a Son?

And again, when He brings the Firstborn into the world, He says: Let all the angels of God do homage to Him.

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.