In the same way, Christ did not take on himself the glory of becoming a high priest. But God said to him, "You are my Son; today I have become your Father." (NIV)
So too Christ (the Messiah) did not exalt Himself to be made a high priest, but was appointed and exalted by Him Who said to Him, You are My Son; today I have begotten You; [Ps. 2:7.] (AMP)
So also Christ glorified not himself to be made an high priest; but he that said unto him, Thou art my Son, to day have I begotten thee. (KJV)