I've seen Hymn and Tune Book of the Methodist Episcopal Church, South, Round Note Edition (Nashville, 1899, no. 899). "Mary S.B. Dana" on the score shown by Brent Hugh (see link above) is a name suffixed to the previous hymn "I'm a Pigrim." "Say Brothers" itself is said to be "Author unknown." "Say Brothers" or hymn with a similar melody hasn't been found in Songs of Zion: A Manual of The Best and Most Popular Hymns and Tunes, For Social and Private Devotion (Boston: American Tract Society, 1851), nor in Horace Waters, comp., The Sabbath-School Bell (New York: Horace Waters, [1859]). Are they different books?