Increase Van Dusen and Maria Van Dusen published temple exposé that includes reference to an oath of vengeance.
Increase Van Dusen and Maria Van Dusen, Startling Disclosures of the Great Mormon Conspiracy (New York: Increase Van Dusen and Maria Van Dusen, 1849), [16]
THE OATH.
You do solemnly swear, in the presence of Almighty God, his holy angels, and these witnesses, that you will avenge the blood of Joseph Smith on this nation, and teach the same to your children; and that you will, from this time henceforth and forever, begin and carry out hostilities against the nation, and to keep the same intent a profound secret, now and forever. So help you God.