O! what, if we are Christ's. Sir H. W. Baker. [Feasts of Martyrs.] First published in Murray's Hymnal, 1852, No. 126, in 6 stanzas of 4 lines, and headed "Ye shall indeed drink of My cup, and be baptized with the baptism that I am baptized with." It was repeated in the following year in the Cooke & Denton Church Hymnal, No. 166, where it was appointed for the "Conversion of St. Paul." This was followed in 1857 by the Salisbury Hymn Book, No. 161, where it was given as one of the hymns for the "Festivals of Martyrs." In 1859 it appeared in the trial copy of Hymns Ancient & Modern, No. 126, with stanza iv., l. 2, changed from " Ever like them to bear," to "Like them in faith to bear," and the substitution of a new doxology. These changes were retained in the authorized Hymns Ancient & Modern, 1861, and in the revised edition, 1875. Also found in a large number of hymn-books.
--John Julian, Dictionary of Hymnology (1907)