George Pullen Jackson notes:
"This ["Say Brothers"] will be recognized as the tune which Julia Ward Howe used for the chorus of the 'Battle Hymn of the Republic'. It is still popular in the above form [as "Say Brothers"] in negro churches of the South." (Spiritual Folk-Songs of Early America, p. 207)
He presents, in addition, a Negro spiritual version of "Say Brothers" in his White and Negro Spirituals (1944; Da Capo, 1975, p. 179), with this comment: "Recorded by the present author as sung May 21, 1933, in Zema Hill's Primitive Baptist Church, Nashville, Tennessee. Earlier variants are in White's Fisk Jubilee Songs of 1872, pages 14 and 140." (p. 179); the tune is practically the same.

The ol'-time religion it is good enough for me,
The ol'-time religion it is good enough for me,
The ol'-time religion it is good enough for me
As we go marching home.

~Masato