Of course some wouldn't want to acknowledge the God-given authority of the Pharisees that Jesus publicly upheld (although taking them to task for their additions but not throwing the baby out with the bathwater) because they have trespassed and vainly taken it upon themselves to determine the holy dates for the festivals of the Lord.
The Church of God ministers and members would do well to read and believe Jesus' statements concerning the Pharisees and know Sivan 6 is the correct date for Pentecost/Shavuot. Any other date is a blind date -- just like the Sadducees followed and fell into the ditch of history.
Jesus and Paul were both Pharisees and acknowledged the God-given authority of the Pharisees on these matters of preserving the sacred calendar and proclaiming the proper holy dates for the Festivals of the LORD. It's past time folks humble themselves and do the same.
Jesus Upheld Jewish Dietary Laws!
The Pharisees
Passover and Pentecost Differences Settled!
The Oracles of God
Raymond McNair Rejects God's government
Jewish Holidays are Biblical Festivals for God's Church!
The Passover Memorial