Note 166 — Chapter VIII · SUNDAY OBSERVANCE UNKNOWN TO CHRISTIANITY BEFORE THE MIDDLE OF THE SECOND CENTURY.
Reading edition
The reader will find this question discussed in detail in “Biblical Teachings Concerning the Sabbath and the Sunday,” p. 26 ff. If that is not at hand, take your Bible and Concordance, and examine each passage in the New Testament where “Sabbath” occurs. Cf. also Sabbath Commentary, by Bailey.