Is fasting three days every month recommended?

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Fasting three days every month is recommended, and there is no known disagreement on this matter. Abu Hurayrah reported that his beloved friend (the Prophet) advised him concerning three things: fasting three days of every month, the two Rak'ahs of Duha (forenoon prayer), and performing Witr before sleep. Furthermore, fasting three days in a month is likened to fasting the entire year because a good deed is rewarded tenfold, as reported concerning Abdullah ibn Amr, which is established by agreement.