Hebrews 5:4-5 Again no one takes this honorable office for himself, but he is called by God, just as Aaron was.

MNT⁽ⁱ⁾ ⁴ Again no one takes this honorable office for himself, but he is called by God, just as Aaron was. ⁵ So even the Christ was not raised to the high glory of the priesthood by himself, but on the contrary by Him who said to him. Thou art my Son; this day have I become thy Father;