'Perfection' in the Bible

Out of Zion, the perfection of beauty,God has shone forth.

I have seen a limit to all perfection;Your commandment is exceedingly broad.

All who pass along the wayClap their hands in derision at you;They hiss and shake their headsAt the daughter of Jerusalem,“Is this the city of which they said,‘The perfection of beauty,A joy to all the earth’?”

“Son of man, take up a lamentation over the king of Tyre and say to him, ‘Thus says the Lord God,“You had the seal of perfection,Full of wisdom and perfect in beauty.

Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?