Increase McGee Van Dusen and Maria Van Dusen publish temple expose, report details of the oath of vengeance.
Increase McGee Van Dusen and Maria Van Dusen, The Mormon Endowment; A Secret Drama, or Conspiracy, in the Nauvoo-Temple, in 1846 (Syracuse, NY: N. M. D. Lathrop, 1847), 9
We are now conducted into another secret room, in the centre of which is an altar with three books on it—the Bible, Book of Mormon, and Doctrine and Covenants, (or Joseph's Revelations). We are required to kneel at this altar, where we have an oath administered to us to this effect; that we will avenge the blood of Joseph Smith on this Nation, and teach our children the same. They tell us that the nation has winked at the abuse and persecution of the Mormons, and the murder of the Prophet in particular; Therefore the Lord is displeased with the nation, and means to destroy it: and this is the excuse for forming this league or conspiracy. We are also sworn by a solemn oath, that we will never divulge what we here see, and do, and agree to, &c.