Pentecost as the Feast of Weeks

Fr. Sean and Fr. Jacob discuss the significance of Pentecost finding its roots in the Jewish Feast of Weeks. There were three traditional pilgrimage feasts for the Jewish people and one of them, the Feast of Weeks, which coincided with the barley harvest, took place 50 days after Passover. How does Pentecost fulfill the handing on of the law?