Joseph Smith manuscript history describing the first time the endowment ceremony was given.

Feb 24, 1845 - Jul 3, 1845
Joseph Smith, Jr.

Joseph Smith, History, 1838–1856, vol. C-1, created 24 Feb. 1845–3 July 1845, 1328–1329, Joseph Smith Papers Project, accessed June 14, 2022

Thomas Bullock
Hyrum Smith, James Adams, Brigham Young, George Miller, Newel K. Whitney, Joseph Smith, Jr., Willard Richards, Heber C. Kimball

<​4​> Wednesday 4 I spent the day in the upper part of the Store (I.E.) in my private office (so called, because in that room I kept my sacred writings, translated ancient records, and received revelations) and in my general business office or Lodge Room (I.E. where the Masonic fraternity met occasionally for want of a better place) in Council with General James Adams, of Springfield, Patriarch Hyrum Smith, Bishops Newel K. Whitney and George Miller,—— —— and Presidents [HC 5:1] Brigham Young, Heber C. Kimball and Willard Richards, instructing them in the principles and order of the Priesthood, attending to washings, anointings, endowments and the communication of Keys pertaining to the Aaronic Priesthood, and so on to the highest order of Melchisedec Priesthood, setting forth the order pertaining to the ancient of Days, and all those plans and principles, by which any one is enabled to secure the fulness of those blessings, which have been prepared for the Church of the first born, and come up and abide in the presence of the Eloheim in the Eternal worlds. In this Council was instituted the Ancient order of things for the first time in these last days. And the communications I made to this Council were of things Spiritual, and to be received only by the Spiritual minded: and there was nothing made known to these men, but what will be made known to all <​the​> Saints of the last days, so soon as they are prepared to receive, and a proper place is prepared to communicate them, even to the weakest of the Saints; <​May 4​> therefore let the Saints be diligent in building the Temple, and all houses which they have been, or shall hereafter be commanded of God to build; and wait their time with patience, in all meekness, faith and perserverance unto the end, knowing assuredly that all these things referred to, in this Counsel, are always governed by the principle of Revelation.

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