At what time the first day of the week came into notice as a festival in the church, it is not easy to determine. The first intimation we have of this, in any ancient writer of acknowledged integrity, is from Justin Martyr's Apology for the Christians, about A. D. 140. He is cited as saying, "that the Christians in the city and in the country assembled on the day called Sunday, and after certain religious devotions, all returned home to their labors;" and he assigns as reasons for this, that God made the world on the first day, and that Christ first showed himself to his disciples on that day after his resurrection. These were the best, and probably all the reasons that could then be offered for the practice. He also speaks of Sunday only as a festival, on which they performed labor, when not engaged in devotions, and not as a substitute for the Sabbath. From this author we can learn nothing as to the extent of the practice; for though he says this was done by those "in the city and in the country," he may have intended only the city of Rome and its suburbs, since Justin, although a native of Palestine in Syria, is stated by Eusebius to have made his residence in Rome. Nor can we determine from this, that he intended any thing more than that they did thus on the Sunday in which the church of Rome, a short time after this, is known to have closed the paschal feast, which was observed annually.

It is contended, however, that mention is made of keeping the first day previous to Justin. The first intimation of this kind, it is believed, is from an apocryphal writing, styled the Epistle of Barnabas; but to this epistle it is objected, that there is no evidence of its genuineness. Eusebius, who lived near the time when it was written, mentions it as a spurious writing, entitled to no credit. Dr. Milnor says it is an injury to St. Barnabas to ascribe this epistle to him. Mosheim says it is the work of some superstitious Jew of mean abilities. And we think it has but little to recommend it besides its antiquity. Barnabas' theory for observing the first day, rests upon the tradition that the seventh day was typical of the seventh millennium of the age of the world, which would be purely a holy age, and that the Sabbath was not to be kept until that time arrived; and he says, "We keep the eighth day with gladness, in which Jesus rose from the dead."

The citations from Ignatius, are as little to the purpose. In the passage of which most use has been made, he did not say that himself or any one else kept the Lord's day, as is often asserted. His own words are, that "the prophets who lived before Christ came to a newness of hope, not by keeping Sabbaths, but by living according to a lordly or most excellent life." In this passage, Ignatius was speaking of altogether a different thing from Sabbath-keeping. There is another quotation from him, however, in which he brings out more clearly his view of the relation existing between the Sabbath and Lord's day. It is as follows: "Let us not keep the Sabbath in a Jewish manner, in sloth and idleness; but let us keep it after a spiritual manner, not in bodily ease, but in the study of the law, and in the contemplation of the works of God." "And after we have kept the Sabbath, let every one that loveth Christ keep the Lord's day festival." From this it seems that he would have the Sabbath kept first, as such, and in a manner satisfactory to the strictest Sabbatarian, after which the Lord's day, not as a Sabbath, but as a festival. Indeed, with this distinction between the Sabbath and a festival before us, it is easy to explain all those passages from early historians which refer to the first day. We shall find them to be either immediately connected with instructions about such seasons as Good Friday and Holy Thursday, or in the writings of those who have recommended the observance of these festival days.

It is also said that Pliny, Governor of Bithynia, A. D. 102, in a letter to Trajan, states that the Christians met on the first day of the week for worship; but by no fair interpretation of his words can he be so understood. He says, in writing about those of his own province, "that they were accustomed to assemble on a stated day." This might be referred to the first day, if there were credible testimony that this day was alone regarded at that time; but as there is no evidence of this, and as the Sabbath is known to have been the stated day of religious assembling a long time after this, it seems more proper to refer it to the Sabbath.

We will mention but one more of these misinterpreted citations, and this is from Dionysius, bishop of Corinth, who lived a little after Justin. His letter to Soter, bishop of Rome, is cited as saying, "This day we celebrated the holy Dominical day, in which we have read your epistle." As given by Eusebius, it is thus: "To-day we have passed the Lord's holy day," &c. The only ground upon which this phrase can be referred to the first day, is, that this day was at that time known by the same title that God has given to the Sabbath, (see Isaiah 48:13,) of which there is no proof. Therefore it is not just to cite this passage as evidence of the observance of the first day at that time.

It is, indeed, a well-known fact, that the first day has come into very extensive use among the great body of Christians, as the only day of weekly rest and worship. The origin of this practice does not appear, however, to be as ancient, by some centuries, as many suppose; nor was its adoption secured at once, but by slow and gradual advances it obtained general notice in Christian countries. This is frankly admitted by Morer, an English Episcopalian, in his Dialogues on the Lord's day, p. 236. He says, "In St. Jerome's time, (that is, in the fifth century,) Christianity had got into the throne as well as into the empire. Yet for all this, the entire sanctification of the Lord's day proceeded slowly; and that it was the work of time to bring it to perfection, appears from the several steps the church made in her constitution, and from the decrees of emperors and other princes, wherein the prohibitions from servile and civil business advanced by degrees from one species to another, till the day got a considerable figure in the world." The same author says, on the same page: "If the Christians in St. Jerome's time, after divine service on the Lord's day, followed their daily employments, it should be remembered, that this was not done till the worship was quite over, when they might with innocency enough resume them, because the length of time and the number of hours assigned for piety were not then so well explained as in after ages."

It is probable that no other day could have obtained the same notice in ancient times as the first day of the week did; for there were circumstances, aside from the resurrection, that had an influence in promoting its observance. It was at first a celebration of the same character as the fourth and sixth days of the week, and the annual festivals of saints and martyrs. These celebrations were comparatively unobjectionable, when not permitted to interfere with a divine appointment; but when they were made to supersede or cause a neglect of the Sabbath, they were criminal. In respect to these days of weekly celebration, Mosheim, when remarking upon this early period, and the regard then paid to the seventh and first days, says, "Many also observed the fourth day, in which Christ was betrayed, and the sixth day, in which he was crucified." He adds, "The time of assembling was generally in the evening after sunset, or in the morning before the dawn."

The respect which the Gentiles had for the first day, or Sunday, while they were Pagans, contributed much to render its introduction easy, and its weekly celebration popular, among such materials as composed the body of the church of Rome in the second, third, and fourth centuries. The observance of the first day of the week as a festival of the Sun, was very general in those nations from which the Gentile church received her converts. That an idolatrous worship was paid to the Sun and other heavenly bodies by the Gentiles, the Old Testament abundantly testifies; and this kind of adoration paid to the Sun in later times, is as plainly a matter of historical record. Thomas Bampfield, an English writer of the seventeenth century, quoting Verstegan's Antiquities, p. 68, says: "Our ancestors in England, before the light of the Gospel came among them, went very far in this idolatry, and dedicated the first day of the week to the adoration of the idol of the Sun, and gave it the name of Sunday. This idol they placed in a temple, and there sacrificed to it." He further states, that from his historical reading, he finds that a great part of the world, and particularly those parts of it which have since embraced Christianity, did anciently adore the Sun upon Sunday. It is also stated by Dr. Chambers, in his Cyclopedia, that "Sunday was so called by our idolatrous ancestors, because set apart for the worship of the Sun." The Greeks and the Latins also gave the same name to the first day of the week. Dr. Brownlee, as quoted by Kingsbury, on the Sabbath, p. 223, also says, "When the descendants of Adam apostatized from the worship of the true God, they substituted in his place the Sun, that luminary which, more than all others, strikes the minds of savage people with religious awe; and which, therefore, all heathens worship." Attachment to particular days of religious celebration, from habit merely, is well known, even in our own day, to be very strong, and powerful convictions of duty are often required to produce a change. This was no doubt well understood by the teachers of Christianity in those times. Dr. Mosheim, when treating on that age, says, "that the leaders imagined that the nations would the more readily receive Christianity when they saw the rites and ceremonies to which they had been accustomed established in the churches, and the same worship paid to Jesus Christ and his martyrs which they had formerly offered to their idol deities. Hence it happened, that in those times, the religion of the Greeks and Romans differed but little in its external appearance from that of Christians."

Prejudice against the Jews, was another influence against the Sabbath, and in favor of the first day. This was very strong, and directly calculated to lead the Gentile Christians to fix a stigma upon every religious custom of the Jews, and to brand as Judaism whatever they supposed had any connection with the Mosaic religion. Hence it was that in those times, as often occurs in our own, to produce disaffection and disgust to the seventh day as the Sabbath, they spoke of it and reproached its observance as Judaizing. This feeling in relation to Judaism led Athanasius, bishop of Alexandria, in Egypt, in the fourth century, who with his people then observed the Sabbath, to say, in his Interpretation of the Psalms, "We assemble on Saturday, not that we are infected with Judaism, but to worship Jesus the Lord of the Sabbath." In a community of Christians whose religion was formal, and whose celebrations were designed more to act upon their passions and senses than to improve their hearts or to conform them to divine requirements, a more powerful argument could scarcely be used against the Sabbath day, or one that would more effectually promote the observance of the first day, which was raised up as its rival. Dr. Neander says distinctly, "Opposition to Judaism introduced the particular festival of Sunday very early."

The observance of the Passover, or Easter, by the early Christians, aided the introduction of the first day as a religious festival in the church, if it was not indeed the direct cause of it. This feast was held by the Asiatic Christians, who began it at the same time the Jews began their Passover, and ended it in like manner, without regard to the particular day of the week. The church of Rome does not appear to have observed it until the latter part of the second century, when, in the time of Victor, bishop of Rome, it seems that it was observed by the Roman and western churches. Victor insisted upon the fast being closed on the first day of the week, on whatever day it might commence; and he claimed the right, as bishop of Rome, to control all the churches in this matter. "Hence," says Eusebius, "there were synods and convocations of the bishops on this question, and all (i. e. the western bishops) unanimously drew up an ecclesiastical decree, which they communicated to all the churches in all places, that the mystery of our Lord's resurrection should be celebrated on no other day than the Lord's day, and that on this day alone we should observe the close of the paschal feasts." The bishops of Asia, however, persisted for a considerable time in observing the custom handed down to them by apostolic tradition, until, either by the threats of excommunication which were made, or by a desire for peace, they were induced partially to adopt the custom of the western churches. This change was made, as we are told, "partly in honor of the day, and partly to express some difference between Jews and Christians." But the question does not appear to have been fully settled; for we find Constantine, in an epistle to the churches, urging them to uniformity in the day of the celebration, wherein, after a strong invective against the practice of the Jews, he says, "For we have learned another way from our Saviour, which we may follow. It is indeed most absurd that they should have occasion of insolent boasting on account of our not being able to observe these things in any manner unless by the aid of their instruction." "Wherefore, let us have nothing in common with that most odious brood of the Jews." By this contest an important point was gained for the first day, although it was but an annual celebration. The Sabbath, however, does not appear to have been laid aside in any place, but continued to be the principal day of religious worship throughout the whole Christian church.