The authority of Cohens who are Rabbis and Rabbis in general affirmed by the Bible
Exodus (NASB) 18:
25 Moses chose able men out of all Israel and made them heads over the people, leaders of thousands, of hundreds, of fifties and of tens. 26 They judged the people at all times; the difficult dispute they would bring to Moses, but every minor dispute they themselves would judge.
This was to become a permanent injunction:
18 You shall appoint for yourself judges and officers in all your towns which the LORD your God is giving you, according to your tribes, and they shall judge the people with righteous judgment.
Later they were commanded to set up a Sanhedrin of 70 elders, or 71 counting Moses.
This was to be the supreme adjudicating body.
16 The LORD therefore said to Moses, ‘Gather for Me seventy men from the elders of Israel, whom you know to be the elders of the people and their officers and bring them to the tent of meeting, and let them take their stand there with you. 17 Then I will come down and speak with you there, and I will take of the spirit which is upon you, and will put it upon them; and they shall bear the burden of the people with you, so that you will not bear it all alone.
This principle was to exist for eternity:
Deuteronomy (NASB) 17:
8 If any case is too difficult for you to decide, between one kind of homicide or another, between one kind of lawsuit or another, and between one kind of assault or another, being cases of dispute in your courts, then you shall arise and go up to the place which the LORD your God chooses. 9 So you shall come to the Levitical priest or the judge who is in office in those days, and you shall inquire of them and they will declare to you the verdict in the case. 10 You shall do according to the terms of the verdict which they declare to you from that place which the LORD chooses; and you shall be careful to observe according to all that they teach you. 11 According to the terms of the law which they teach you, and according to the verdict which they tell you, you shall do; you shall not turn aside from the word which they declare to you, to the right or the left. 12 The man who acts presumptuously by not listening to the priest who stands there to serve the LORD your God, nor to the judge, that man shall die; thus you shall purge the evil from Israel. 13 Then all the people will hear and be afraid, and will not act presumptuously again.
The Cohen or the Levi or the Judge who will be in those days will tell you how to apply the Law (Deuteronomy 17:9).
This is a known phenomenon.
Others have written about it in the past.
The Rabbi from Lemberg, "Rabbi Joseph Shaul Ha-Levi Nathanson (1808-1875), ("Shaylot ve-Rsehuvot, Shoal ve-Mashiv," Hakdoma) discusses the subject attributing most important decisive Halachic rulings in this present age to the Tribe of Levi.