As Shaykh Abú-Turáb arose to depart in the hope of terminating the proceedings, Ḥusayn Khán intervened and said: “We shall require a person of recognised standing to give bail and surety for him, and to pledge his word in writing that if ever in future this youth should attempt by word or deed to prejudice the interests either of the Faith of Islám or of the government of this land, he would straightway deliver him into our hands, and regard himself under all circumstances responsible for his behaviour.” Ḥájí Mírzá Siyyid ‘Alí, the Báb’s maternal uncle, who was present at that meeting, consented to act as the sponsor of his Nephew. In his own handwriting he wrote the pledge, affixed to it his seal, confirmed it by the signature of a number of witnesses, and delivered it to the governor; whereupon Ḥusayn Khán ordered that the Báb be entrusted to the care of His uncle, with the condition that at whatever time the governor should deem it advisable, Ḥájí Mírzá Siyyid ‘Alí would at once deliver the Báb into his hands.
(Chapter 8, ‘The Dawn-Breakers’)