Section 81: While the recipient of Section 81 has traditionally been believed to be Frederick G. Williams, the "Kirtland Revelation Book" discloses that the revelation was intended for Jesse Gause. The page index for the record book notes the following for Section 81: "Revelation to Jesse Gause March 15, 1832." The "Kirtland Revelation Book" further reveals that the words "my servant Jesse" have been altered to read "my servant Frederick G. Williams." Because Williams later replaced Gause as counselor in the Presidency, liberty has been taken to substitute the names.
[Source: Cook, Lyndon, Revelations of the Prophet Joseph Smith: A Historical and Biographical Commentary of the Doctrine and Covenants, http://amzn.to/RevelationsofJosephSmith]