Joseph Smith and Rigdon rebaptize each other for remission of sins and "renewal of covenants." Church leaders would promote rebaptism for all members during a religious reformation beginning May 1842. In the future, four temples would perform 7,788 baptisms for renewal of covenants from 1877 through 1893. This ordinance would be officially discontinued in 1922.
[Quinn, D. Michael, The Mormon Hierarchy: Origins of Power, Appendix 7: Selected Chronology of the Church of Jesus Christ of Latter-day Saints, 1830-47, http://amzn.to/origins-power]