April 27

Now the Siyyid Báb had disposed all His affairs before setting out from Chihríq towards Tabríz, had placed His writings and even His ring and pen-case in a specially prepared box, put the key of the box in an envelope, and sent it by means of Mullá Báqir, who was one of His first associates, to Mullá ‘Abdu’l-Karím of Qazvín. This trust Mullá Báqir delivered over to Mullá ‘Abdu’l-Karím at Qum in presence of a numerous company. At the solicitations of those present he opened the lid of the box and said, “I am commanded to convey this trust to Bahá’u’lláh: more than this ask not of me, for I cannot tell you.” Importuned by the company, he produced a long epistle in blue, penned in the most graceful manner with the utmost delicacy and firmness in a beautiful minute shikastih hand, written in the shape of a man so closely that it would have been imagined that it was a single wash of ink on the paper. When they had read this epistle [they perceived that] He had produced three hundred and sixty derivatives from the word Bahá. Then Mullá ‘Abdu’l-Karím conveyed the trust to its destination. 
(‘Abdu’l-Baha, ‘A Traveler’s Narrative’)