Those who in our own times have revived the observance of the Jewish Sabbath, show us how much may be said on their side,

They were keeping it "unleavened "ceremonially, and he urges a spiritual unleavening as more important. The Christian hallowing of Pentecost connects with the Paschal argument.

We observe the exact day; neither adding, nor taking away. For in Asia also great lights have fallen asleep, which shall rise again on the day of the Lord's coming, when he shall come with glory from heaven, and shall seek out all the saints. Among these are Philip, one of the twelve apostles, who fell asleep in Hierapolis; and his two aged virgin…

It is surely noteworthy that nobody doubted that it was kept by a Christian and Apostolic ordinance. So St. Paul argues from its Christian observance, in his rebuke of the Corinthians.

All these observed the fourteenth day of the passover according to the Gospel, deviating in no respect, but following the rule of faith. And I also, Polycrates, the least of you all, do according to the tradition of my relatives, some of whom I have closely followed. For seven of my relatives were bishops; and I am the eighth. And my relatives always…