Mírzá Yahyá's henceman, Siyyíd Muhammad, convinced Yahyá to challenge Bahá'u'lláh to to face-to-face encounter in the mosque of Sultán Salím in a distant part of the city, believing that Bahá'u'lláh would not show. Bahá'u'lláh immediately set out to walk to the appointed mosque. Upon learning this Mírzá Yahyá postponed the interview for a day or two. Bahá'u'llah returned to His home and revealed a Tablet to be delivered to Siyyíd Muhammad when he produced a sealed note stating that should Mírzá Yahyá fail to appear at the trysting-place, he would produce a document refuting Yahyá's claims. Neither were forthcoming and the Tablet to Siyyid Muhammad remained undelivered.

Prior to this the community had been divided however this incident firmly established His ascendency. The Covenant of the Báb had prevailed [GPB168-170]

Try also a shorter date like 1867-09-0 or 1867-09

try also the Chronology Canada — 1867-09-02 or 1867-09-0 or 1867-09