10. Even after the unique descent of the Spirit on that Pentecost Sunday fifty days after Calvary at the birthday of the New Testament Church Visible, that Apostolic Church frequently commemorated that final ‘Old Testament’ Pentecost Harvest Feast — at subsequent Annual ‘Whitsuntide’ Festivals. However, this was done only in a non- ceremonial alias a New Testament way. Acts 18:21; 20:16; 21:17-20; I Cor. 16:8-9.
11. The Patristic Church commemorated Whitsuntide each year. It did so in a specifically New Testament way, and with much blessing. Thus: Hippolytus; Tertullian; Origen; Eusebius; the Apostolic Constitutions; Chrysostom; Augustine; Leo; Schaff; etc.