Hebrews 5:5

5 So also Christ did not glorify himself in becoming a high priest, but was appointed by the one who said to him, "You are my Son, today I have begotten you";

Hebrews 5:5 In-Context

3 and because of this he must offer sacrifice for his own sins as well as for those of the people.
4 And one does not presume to take this honor, but takes it only when called by God, just as Aaron was.
5 So also Christ did not glorify himself in becoming a high priest, but was appointed by the one who said to him, "You are my Son, today I have begotten you";
6 as he says also in another place, "You are a priest forever, according to the order of Melchizedek."
7 In the days of his flesh, Jesus offered up prayers and supplications, with loud cries and tears, to the one who was able to save him from death, and he was heard because of his reverent submission.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.