Hebrews 5:4-6

Young's Literal Translation

⁴ and no one to himself doth take the honour, but he who is called by God, as also Aaron:

⁵ so also the Christ did not glorify himself to become chief priest, but He who spake unto him: `My Son thou art, I to-day have begotten thee;'

⁶ as also in another [place] He saith, `Thou [art] a priest -- to the age, according to the order of Melchisedek;'