Joseph F. Smith believes that D&C 101 (1835 ed. of the Doctrine and Covenants) was added by Oliver Cowdery without any authority from Joseph.

Speech / Court Transcript
Joseph F. Smith
Scribed Verbatim

Joseph F. Smith, "Plural Marriage—For the Righteous Only—Obedience Imperative—Blessings Resulting," July 7, 1878, Journal of Discourses, 26 vols. (Liverpool: William Budge, 1880), 20:29

George F. Gibbs
The Joseph Smith Papers, Oliver Cowdery, Joseph F. Smith
Reading Public, Members of The Church of Jesus Christ of Latter-day Saints

. . . I here declare that the principle of plural marriage was not first revealed on the 12th day of July, 1843. It was written for the first time on that date, but it had been revealed to the Prophet many years before that, perhaps as early as 1832. About this time, or subsequently, Joseph, the Prophet, intrusted this fact to Oliver Cowdery; he abused the confidence imposed in him, and brought reproach upon himself, and thereby upon the church by "running before he was sent," and "taking liberties without license," so to speak, hence the publication, by O. Cowdery, about this time, of an article on marriage, which was carefully worded, and afterwards found its way into the Doctrine and Covenants without authority. This article explains itself to those who understand the facts, and is an indisputable evidence of the early existence of the knowledge of the principle of patriarchal marriage by the Prophet Joseph, and also by Oliver Cowdery.

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