The potential for confusion appears in a statement from Clement of Alexandria’s Stromata 6.16: “For one may venture to say that the eighth is properly the seventh, and the seventh actually the sixth; that is the eighth is properly a sabbath, and the seventh a day of work.” See Everett Ferguson, “Was Barnabas a Chiliast? An Example of Hellenistic Number Symbolism in Barnabas and Clement of Alexandria,” in Greeks, Romans, and Christians, Abraham J. Malherbe Festschrift, (Minneapolis: Fortress, 1990), pp. 157–167, here p. 166.