Blessed are they whose hearts are pure. H. Alford. [St. Bartholomew.] In Alford's Poems, 1868, this hymn is dated 1844. It is not in his Psalms & Hymns of that year. It is found in T. M. Fallow's Selection, 1847. In 1852 it was repeated in The English Hymnal, in 1867 in Alford's Year of Praise, and again in other collections. In the Cooke and Denton Hymnal, 1853, it appears in the Index as "Blessed," &c.; but in the body of the book, No. 175, it begins, "How bless’d are they," &c. In some hymnals, both in Great Britain and America, it is attributed to "J. Conder." [William T. Brooke]
-- John Julian, Dictionary of Hymnology (1907)
===============
Blessed are they whose hearts are pure. Appeared in Dean Alford's Poetical Works, 1845, vol. ii., p. 151, and later as stated on p. 147, ii.
--John Julian, Dictionary of Hymnology, New Supplement (1907)