 In the sixth century , <unk> of <unk> taught that the whole glory of the Jewish Sabbath had been transferred to Sunday and that Christians must keep Sunday in the same way as the Jews were commanded to keep the Sabbath . The Council of <unk> in 538 <unk> this tendency , to apply the law of the Jewish Sabbath to the observance of the Christian Sunday , as Jewish and non @-@ Christian . 
