Summary

Clement of Rome Ante-Nicene Fathers Vol. VII, Constitutions of the Holy Apostles… (1885)

For to Jews the Lord is still dead, but to Christians He is risen: to the former, by their unbelief; to the latter, by their full assurance of faith. For the hope in Him is immortal and eternal life. After eight days let there be another feast observed with honour, the eighth day itself, on which He gave me Thomas, who was hard of belief, full assurance, by showing me the print of the nails, and the wound made in His side by the spear.
Source: Wikisource

Clement of Rome Ante-Nicene Fathers Vol. VII, Constitutions of the Holy Apostles… (1885)

And again, from the first Lord’s day count forty days, from the Lord’s day till the fifth day of the week, and celebrate the feast of the ascension of the Lord, whereon He finished all His dispensation and constitution, and returned to that God and Father that sent Him, and sat down at the right hand of power, and remains there until His enemies are put under His feet; who also will come at the consummation of the world with power and great glory, to judge the quick and the dead, and to recompense to every one according to his works.
Source: Wikisource

Clement of Rome Ante-Nicene Fathers Vol. VII, Constitutions of the Holy Apostles… (1885)

Keep your nights of watching in the middle of the days of unleavened bread. And when the Jews are feasting, do you fast and wail over them, because an the day of their feast they crucified Christ; and while they are lamenting and eating unleavened bread in bitterness, do you feast. [59] But no longer be careful to keep the feast with the Jews, for we have now no communion with them; for they have been led astray in regard to the calculation itself, which they think they accomplish perfectly, that they may be led astray on every hand, and be fenced off from the truth.
Source: Wikisource

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