My friend (i.e. the Prophet) instructed me to observe three practices that I do not leave while traveling nor while resident, to pray two rak`ahs in the forenoon, to fast three days every month and not to sleep but after observing the witr.
Reference: Sunan Abi Dawud 1432 In-book : Book 8, Hadith 17 English translation : Book 8, Hadith 1427
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