Faithful, O Lord, Thy mercies are. C. Wesley. [God's Faithfulness.] In several American hymn-books two hymns are given with this opening line, as follows:—
(1) No. 306, in Longfellow and Johnson's Hymns of the Spirit, 1864, in 2 stanzas of 4 lines. This is No. 171 of C. Wesley's Short Hymns, &c, 1762, vol. i., on Ex. xxxiv. 6. (2) The second is in the Baptist Praise Book, 1871, No. 216, and is composed of portions of Nos. 169, 170, 171 of the Short Hymns, &c. (Poetical Works, 1868-72, vol. ix. p. 55).
--John Julian, Dictionary of Hymnology (1907)