Narrated Abu Huraira: My friend (the Prophet ) advised me to observe three things: (1) to fast three days a month; (2) to pray two rak`at of Duha prayer (forenoon prayer); and (3) to pray witr before sleeping.
Hadith ReferenceSahih Bukhari / The Book of As-Saum (The Fasting). / Hadith: 1981
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة