Preble was the first Millerite to promote the sabbath in print form, through the February 28, 1845, issue of the Adventist "Hope of Israel" in Portland, Maine. In March he published his sabbath views in tract form as "A Tract, Showing that the Seventh Day Should be Observed as the Sabbath, Instead of the First Day; "According to the Commandment"". This tract led to the conversion of John Nevins Andrews and other Adventist families in Paris, Maine, as well as the 1845 conversion of Joseph Bates, who became the foremost proponent of the sabbath among this group. These men in turn convinced James Springer White, Ellen Harmon (later White), and Hiram Edson of New Hampshire. Preble is known to have kept seventh-day sabbath until mid-1847. He later repudiated the sabbath and opposed the Seventh-day Adventists, authoring "The First-Day Sabbath".