It was during one of his visits to 'Akká that Haji Mirza Haydar-'Ali was allowed to enter the presence of Bahá'u'lláh at the time of revelation. He has left to posterity the following brief account of that memorable occasion:
...When permission was granted and the curtain was withdrawn, I entered the room where the King of kings and the Ruler of this world and the next, nay rather the Ruler of all the worlds of God, was with great authority seated on His couch. The verses of God were being revealed and the words streamed forth as in a copious rain. Methought the door, the wall, the carpet, the ceiling, the floor and the air were all perfumed and illumined. They all had been transformed, each and every one, into ears and were filled with a spirit of joy and ecstasy. Each object had become refreshed and was pulsating with life... To which worlds I was transported and in what state I was, no one who has not experienced such as this can ever know.
(Adib Taherzadeh, ‘The Revelation of Baha'u'llah vol. 1)