Prayer at Night (Tahajjud)

Bukhari :: Book 2 :: Volume 21 :: Hadith 274

Narrated Abu Huraira:

My friend (the Prophet) advised me to do three things and I shall not leave them till I die, these are: To fast three days every month, to offer the Duha prayer, and to offer Witr before sleeping.

Source materials are from the University of Southern California MSA site
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