Justin Martyr, First Apology 67

We, however, continue after this to remind each other of these things; those who have means assist all who are in need, and we always stay united. Over everything we share we bless the Creator of all through His Son Jesus Christ and through the Holy Spirit. On the day called Sunday, everyone living in cities or in the country gathers together in one place, and the memoirs of the apostles or the writings of the prophets are read for as long as time allows. When the reader finishes, the president gives a discourse of admonition and exhortation to imitate these good things. Then we all stand together and offer prayers; and, as we said before, when we have finished praying, bread is brought forward with wine and water, and the president likewise offers prayers and thanksgivings to the best of his ability, and the people give their assent by saying 'Amen.' The distribution and reception of the elements over which thanks has been given takes place for each person, and portions are sent through the deacons to those who are not present. Those who are prosperous and willing each give whatever they choose, and what is collected is deposited with the president; he himself cares for orphans and widows, for those in need because of sickness or any other cause, for those in prison, for strangers sojourning among us, and in short for all who are in need. We all hold our common assembly on Sunday because it is the first day, the day on which God transformed darkness and matter to make the world, and on which our Savior Jesus Christ rose from the dead; for they crucified Him on the day before the Sabbath, and on the day after the Sabbath, which is Sunday, He appeared to His apostles and disciples and taught them these things, which we have handed on to you for your examination.