Divisions Rachel (Harris) Oakes Preston (March 2, 1809 – February 1, 1868) was a Seventh Day Baptist who persuaded a group of Adventist Millerites to accept Saturday, instead of Sunday, as Sabbath.

Born in Vernon, Vermont, Rachel, daughter of Sylvanus Harris, first joined the Methodist Church.

While attending the "Christian Brethren" church with her daughter, Rachel tried to present her views on seventh-day Sabbath.

Due to Rachel's influence, Frederick Wheeler (1811–1910), an ordained minister of the Methodist Episcopal Church, and promoter of the prophetic teachings of William Miller, preached his first sermon on seventh-day Sabbath to his "Christian Brethren" congregation on March 16, 1844.

Further due to Rachel's influence, William Farnsworth (1807–1888), after the Great Disappointment of October 22, 1844, stated publicly to the "Christian Brethren" congregation his conviction that Saturday, being the seventh day of the week, was Sabbath.