but he holds his priesthood permanently since he lives forever.

For when the priesthood changes, a change in the law must come ¹  as well.

he was chosen by lot, according to the custom of the priesthood, ¹  to enter ²  the holy place ³  of the Lord and burn incense.

during the high priesthood ¹  of Annas and Caiaphas, the word ²  of God came to John the son of Zechariah in the wilderness. ³ 

you yourselves, as living stones, are built up as a spiritual house to be a holy priesthood and to offer ¹  spiritual sacrifices that are acceptable to God through Jesus Christ.

But you are a chosen race, a royal priesthood, a holy nation, a people of his own, so that you may proclaim the virtues ¹  of the one who called you out of darkness into his marvelous light.

So if perfection had in fact been possible through the Levitical priesthood – for on that basis ¹  the people received the law – what further need would there have been for another priest to arise, said to be in the order of Melchizedek and not in Aaron’s order?