In the Tent of Meeting, outside the curtain which is before the Testimony, Aaron and his sons will set it in order, to burn from evening to morning before Adonai. It will be a statute forever throughout their generations, on behalf of Bnei-Yisrael.
Bring with you your brothers, the tribe of Levi, the tribe of your father, so that they may join you and assist you, both you and your sons with you, before the Tent of the Testimony.
Now if perfection was through the Levitical priesthood (for based on it the people had been given the Torah), what further need was there for a different kohen to arise—designated according to the order of Melechizedek , not according to the order of Aaron?