‘Imran b. Husain said that the Prophet asked him, or that he asked a man in ‘Imran’s hearing,“Father of so and so, did you not fast the last day of Sha'ban?" When, he replied that he had not, he said,“If you did not observe a fast, you must fast for two days."* *To reconcile this tradition with that of Abu Huraira at the foot of p.420 it is suggested that the man had made a vow to observe this fast, or that it was his custom. (Bukhari and Muslim.)