It is narrated from Hazrat Imran bin Husain (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) asked someone, "Have you kept any fast at the end of this month of Sha'ban?" He replied, "No." The Prophet (peace and blessings be upon him) said, "When the fasts of Ramadan are finished, then keep a fast for one or two days."