Assembled in Thy house of prayer. J. Montgomery. [Divine Service.] Written for the Sheffield Sunday School Union, Whitsuntide gathering, 1840, and first printed on a fly-sheet for use at that time. The same year it was sent to Dr. Leifchild, and in 1842 it appeared as No. 31, in 6 stanzas of 4 lines, in his collection of Original Hymns, and headed, "For a divine blessing on the ministry of the word." (M. MSS.) In Montgomery's Original Hymns, 1853, it reappeared with the same title as No. 98.
-- John Julian, Dictionary of Hymnology (1907)