Chapter: To fast the 13th, 14th and 15th of the lunar months.

Hadith Number 1981

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Narrated Abu Huraira

My friend (the Prophet (ﷺ) ) 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.