George A. Smith recalls Hyrum Smith reading the plural marriage revelation to him.
George A. Smith, Letter to Joseph Smith III, October 9, 1869, in Journal History of the Church, CR 100 137, CHL
When I (G.A.S.) returned to Nauvoo from my mission in the fall of 1843, I met Hyrum at the landing. He accompanied me on the way to my home, when he recited the most of the Revelation of Patriarchial Marriage, and invited me to his house to receive further instruction. Next day, I called on your father, who expressed his gratitude at the conversion of brother Hyrum, and gave me additional views on the subject, and spoke of the results of the same in the eternal worlds.