Section 132 of the Doctrine & Covenants is not universally accepted as a revelation received by Joseph Smith. When the discussion cannot proceed beyond whether this originated from Joseph Smith, by revelation, the discussion goes nowhere. Therefore, the first step must be to resolve whether the revelation came through Joseph Smith, or was a later fabrication of Brigham Young and his inner circle of polygamists.
The following information persuades me Section 132 came through Joseph Smith and was reduced to writing on July 12, 1843:
The Nauvoo Diaries of William Clayton were written chronologically and have the following entries (exactly as in original):
July 11, 1843: At noon rode out to farm with Margt. P.M. J & family rode out in the carriage.
July 12, 1843: This A.M. I wrote a Revelation consisting of 10 pages on the order of the priesthood, showing the designs in Moses, Abraham, David and Solomon having many wives & concubines. After it was wrote Prests. Joseph and Hyrum presented it and read it to E. who said she did not believe a word of it and appeared very rebellious. J told me to Deed all the unincumbered lots to E & the children. He appears much troubled about E.
July 13: 1843: This A.M. J sent for me & when I arrived he called me up into his private room with E. and there stated an agreement they had mutually entered into. they both stated their feelings on many subjects & wept considerable. O may the Lord soften her heart that she may be willing to keep and abide his Holy Law.
July 15, 1843: Made Deed for 1/2 S. B. Iowa from J. to Emma. Also a Deed to E. for over 60 city lots.
July 16, 1843: A.M. at home writing bro. Kimballs lecture. P.M. went to the Grove and heard Pres. J. preach on the law of the priesthood. He stated that Hyrum held the office of prophet to the church by birthright & he was going to have a reformation and the saints must regard Hyrum for he has authority. He showed that a man must enter into an everlasting covenant with his wife in this world or he will have no claim on her in the next. He said that he could not reveal the fulness of these things untill the Temple is completed &c.
July 17, 1843: A.M. at the Temple & at Prest. J’s. conversed with J. & Hyrum on the priesthood.
In addition to the foregoing, I checked surrounding public events, and the diary is consistent with other records of those days. For example, the event on July 16th is recorded as having taken place “At Stand in Grove, West of Temple” and appears in a letter of Willard Richards to Brigham Young, the Joseph Smith diary kept by Willard Richards, the Levi Richards Diary and the Willard Richards Diary. The afternoon of the 16th also records a public meeting on the “Temple Stand” in the Franklin Richards, William Clayton, and Levi Richards diaries and in the Letter of Willard Richards to Brigham Young, as well as in the Joseph Smith diary kept by Willard Richards.
Disputes after Joseph’s death also confirm a disagreement between Emma and the church over ownership in the Steamboat the Maid of Iowa.
These entries seem credible, and therefore I believe they show Section 132 was recorded on July 12, 1843 and originated from Joseph Smith. In addition, the August 12, 1843 meeting of the Nauvoo High Council records there was “teaching by Hyrum Smith” which four witnesses later confirmed included reading Section 132. These witnesses were Austin Cowles (who rejected the doctrine and left the church), David Fulmer, Thomas Grover, James Allred and Aaron Johnson. Hosea Stout was absent when Hyrum read the document, but was later told about the revelation. When Section 132 became public, Hosea Stout confirmed it “corresponded to what” he was told about the reading in August 1843.
It is possible to believe it a fabrication of Brigham Young. It was not made public until the 1850’s, and the public disclosure was on Brigham Young’s watch. But the document came into existence while Joseph was church president, and came through him. As much as a person may wish the document did not originate with Joseph Smith, the evidence appears to be more than adequate to show it did. It came from Joseph and was reduced to written form in July 1843.