To Him Muḥammad, the Apostle of God, had alluded in His Book as the “Great Announcement,” and declared His Day to be the Day whereon “God” will “come down” “overshadowed with clouds,” the Day whereon “thy Lord shall come and the angels rank on rank,” and “The Spirit shall arise and the angels shall be ranged in order.” His advent He, in that Book, in a súrih said to have been termed by Him “the heart of the Qur’án,” had foreshadowed as that of the “third” Messenger, sent down to “strengthen” the two who preceded Him. To His Day He, in the pages of that same Book, had paid a glowing tribute, glorifying it as the “Great Day,” the “Last Day,” the “Day of God,” the “Day of Judgment,” the “Day of Reckoning,” the “Day of Mutual Deceit,” the “Day of Severing,” the “Day of Sighing,” the “Day of Meeting,” the Day “when the Decree shall be accomplished,” the Day whereon the second “Trumpet blast” will be sounded, the “Day when mankind shall stand before the Lord of the world,” and “all shall come to Him in humble guise,” the Day when “thou shalt see the mountains, which thou thinkest so firm, pass away with the passing of a cloud,” the Day “wherein account shall be taken,” “the approaching Day, when men’s hearts shall rise up, choking them, into their throats,” the Day when “all that are in the heavens and all that are on the earth shall be terror-stricken, save him whom God pleaseth to deliver,” the Day whereon “every suckling woman shall forsake her sucking babe, and every woman that hath a burden in her womb shall cast her burden,” the Day “when the earth shall shine with the light of her Lord, and the Book shall be set, and the Prophets shall be brought up, and the witnesses; and judgment shall be given between them with equity; and none shall be wronged.” The plenitude of His glory the Apostle of God had, moreover, as attested by Bahá’u’lláh Himself, compared to the “full moon on its fourteenth night.” His station the Imám ‘Alí, the Commander of the Faithful, had, according to the same testimony, identified with “Him Who conversed with Moses from the Burning Bush on Sinai.” To the transcendent character of His mission the Imám Ḥusayn had, again according to Bahá’u’lláh, borne witness as a “Revelation whose Revealer will be He Who revealed” the Apostle of God Himself. About Him _Sh_ay_kh_ Aḥmad-i-Ahsá’í, the herald of the Bábí Dispensation, who had foreshadowed the “strange happenings” that would transpire “between the years sixty and sixty-seven,” and had categorically affirmed the inevitability of His Revelation had, as previously mentioned, written the following: “The Mystery of this Cause must needs be made manifest, and the Secret of this Message must needs be divulged. I can say no more, I can appoint no time. His Cause will be made known after Ḥin (68)” (i.e., after a while).