"Life of Heber C. Kimball", by Orson Ferguson Whitney. Orson Ferguson Whitney was member of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints (1855-1931).
History, tinged with tradition, affirms these to be the circumstances under which those words were uttered: The Savior had chosen Twelve Apostles, and had commissioned them to go into all the world and preach the Gospel to every creature.