Early Christians
"...The Sabbath was a strong tie which united them with the life of the whole people, and in keeping the Sabbath holy they followed not only the example but also the command of Jesus." "Geschichte des Sonntags," pp.13, 14
2nd Century Christians
"The Gentile Christians observed also the Sabbath," Gieseler's "Church History," Vol.1, ch. 2, par. 30, 93. Early Christians
"The primitive Christians did keep the Sabbath of the Jews;...therefore the Christians, for a long time together, did keep their conventions upon the Sabbath, in which some portions of the law were read: and this continued till the time of the Laodicean council." "The Whole Works" of Jeremy Taylor, Vol. IX,p. 416 (R. Heber's Edition, Vol XII, p. 416).
2nd, 3rd, 4th Centuries
"From the apostles' time until the council of Laodicea, which was about the year 364, the holy observance of the Jews' Sabbath continued, as may be proved out of many authors: yea, notwithstanding the decree of the council against it." "Sunday a Sabbath." John Ley, p.163. London: 1640.