With regards to the 'authority of the Pharisees,' I have yet to be presented with any scripture which suggests in the least that their authority extended beyond that particular time period when Christ spoke in this regard
I've properly presented plenty of Scriptures that don't only "suggest" but prove the God-given authority of the Pharisees is established until Shiloh comes - the return of the King of the Jews - who will reign from Jerusalem.
Jesus declared that "the scribes and the PHARISEES sit in Moses' seat" of AUTHORITY (Matt. 23:2). God has ordained that the Jews preserve His Word on the Law, Prophets and Writings - despite themselves (Rom. 3:2-3).
1 Then Jesus spoke to the multitudes and to His disciples, 2 saying: “The scribes and the Pharisees sit in Moses’ seat. 3 Therefore whatever they tell you to observe, that observe and do, but do not do according to their works; for they say, and do not do.
And I've always stressed they have that God-given authority over us at least in regard to proclaiming and determining the proper holy dates/days.
And note well this important fact: Paul wrote that God has given it to the Jews to preserve "the oracles of God" (God's Word, sacred calendar, holy days) even after Jesus had given authority to His disciples. He didn't say, "Now God's Church has seized control of everything." That's a Catholic doctrine of demons; part of its accursed replacement theology and attempt to change the times and the seasons. Furthermore, Yeshua commanded His disciples/apostles to teach others what He had commanded them and that includes the recognition of the God-given authority of the Pharisees.
1What advantage then hath the Jew? or what profit is there of circumcision?
2Much every way: chiefly, because that unto them were committed the oracles of God.
10 The scepter shall not depart from Judah, Nor a lawgiver from between his feet, Until Shiloh comes
This clearly proves to those not wearing traditional blinders that the JEWS are responsible for these matters, and Yeshua and Paul clarified which Jews by acknowledging the God-given authority of the Pharisees. Two witnesses against those who would shamefully teach otherwise.
God is true and those who oppose His Word and Will are liars, because God will not renege on giving Judah this special calling and precious gift that some covet and others seek to steal (Gen. 49:10, Rom. 11:29).
28 Concerning the gospel they are enemies for your sake, but concerning the election they are beloved for the sake of the fathers. 29 For the gifts and the calling of God are irrevocable.
God has clearly stated He has empowered the Jews, specifically the Pharisees, to preserve His oracles and proclaim and determine His holy dates/days until Shiloh comes, until the return of the King of the JEWS. How plain and simple and consistent for those with eyes to see.