And the Levitical singers, all of them of Asaph, of Heman, of Jeduthun, with their sons and their brothers, being clothed in white linen, having cymbals and with harps and lyres, stood at the east end of the altar, and with them a hundred and twenty priests sounding with trumpets,

Therefore if perfection were by the Levitical priesthood (for under it the people received the Law), what further need was there that another priest should rise after the order of Melchizedek, and not be called after the order of Aaron?