It is narrated from Hazrat Abu Darda (may Allah be pleased with him) that my beloved friend Abu al-Qasim (peace and blessings be upon him) advised me regarding three things which I will never abandon: the Prophet (peace and blessings be upon him) advised me to fast three days every month, to perform Witr before sleeping, and to offer the Duha (forenoon) voluntary prayers whether at home or on a journey.