Analysis of information sources in references of the Wikipedia article "Ngày Sabát trong các Hội thánh An thất nhật" in Vietnamese language version.
As predominantly Methodists and other nonconformists, British immigrants were pietists, committed to conversion and the reform of society. They did not separate religion from civil government, bur rather integrated right belief with right behavior. Therefore they embraced reform movements, most notably temperance and abolitionism, as well as Sabbatarian laws.
there is historical evidence of some observance of the seventh-day Sabbath among the Waldenses. A report of an inquisition before whom were brought some Waldenses of Moravia in the middle of the fifteenth century declares that among the Waldenses "not a few indeed celebrate the Sabbath with the Jews."—Johann Joseph Ignaz von Dollinger, Beitrage zur Sektengeschichte des Mittelalters (Reports on the History of the Sects of the Middle Ages), Munich, 1890, 2d pt., p. 661. There can be no question that this source indicates the observance of the seventh-day Sabbath..
