So also Christ did not glorify himself in becoming high priest, but the one who glorified him was God, ¹  who said to him, “You are my Son! Today I have fathered you,” ² 

For to which of the angels did God ¹  ever say, “You are my son! Today I have fathered you”? ²  And in another place ³  he says, ⁴  “I will be his father and he will be my son.” ⁵