Justin Martyr, about Sunday

<p><i>First Apology</i>, LXVII, "On the day called Sunday, all who live in cities or in the country gather together to one place, and the memoirs of the apostles or the writings of the prophets are read, as long as time permits... Sunday is the day on which we all hold our common assembly, because... Jesus Christ our Saviour on the same day rose from the dead."</p>

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Source: Grand Rapids: Eerdmans, 1973], 1:186.</p>