Abu Huraira reported. My friend (the Holy Prophet, may peace be upon him) has instructed me to do three things: three fasts during every month, two rak’ahs of the forenoon prayer, and observing Witr prayer before going to bed.
SAHIH MUSLIM (Book 4, Hadith 1558)
SAHIH MUSLIM (Book 4, Hadith 1559)
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.
SAHIH BUKHARI (Vol. 3, Book 31, Hadith 202)