2 Bible Verses about Priesthood, In Ot

[So], God declared Him to be a Head Priest according to the order of Melchizedek.

So, if perfection [i.e., a right relationship with God] could have been attained through the Levitical priesthood, (for under it people had received the law of Moses), what further need would there have been for another priest to arise, according to the order of Melchizedek, who was not considered "according to the order of Aaron"? For with the changing of the priesthood, it was necessary for a change to be made in the law also. For the Lord [See next verse], about whom these things are being said, belonged to another tribe, from which no one has [ever] been appointed to serve at the Altar.read more.
For it is quite evident that our Lord has descended from Judah, a tribe about which Moses said nothing concerning priests. And this is even clearer if another priest like Melchizedek arises, who was not appointed on the basis of human regulations governing one's physical ancestry, but on the strength of One whose life never ends. For it is declared [about Jesus in the Scriptures, Psa. 110:4], "You are a priest forever according to the order of Melchizedek."