I gave him repeated assurances punctually to perform whatever he might require. "Then," said he, "in the evening, you must be at the mosque built by the caliph's lady on the bank of the Tigris, and wait there till somebody comes to conduct you." To this I agreed; and after passing the day in great impatience, went in the evening to the prayer that is said an hour and a half after sun-set in the mosque, and remained there after all the people had departed.