On the recommendation to fast three days of every month

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

230. Chapter: On the recommendation to fast three days of every month

It is best to fast the 'white days', which are the thirteenth, fourteenth and fifteenth.

1258. Abu Hurayra said, "My friend, may Allah bless him and grant him peace, ordered me to do three things: to fast three days every month, to do the two rak'ats of Duha and to do the witr before sleeping." [Agreed upon]

1259. Abu'd-Darda' said, "My beloved, may Allah bless him and grant him peace, commanded me to do three things which I will not forego as long as I live: to fast three days of every month, to pray Duha, and not to sleep until after praying the witr." [Muslim]

1260. 'Abdullah ibn 'Amr ibn al-'As reported said that the Messenger of Allah, may Allah bless him and grant him peace, said, "Fasting three days every month is equivalent to fasting continuously." [Agreed upon]

1261. Mu'adha al-'Adawiyya asked 'A'isha , "Did the Messenger of Allah fast three days of every month?" She said, "Yes." "I said, 'What part of the month did he fast?' She said, 'He did not care what part of the month he fasted.'" [Muslim]

1262. Abu Dharr reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "If you fast three days of the month, then fast the thirteenth, fourteenth and fifteenth." [at-Tirmidhi]

1263. Qatada ibn Milhan said, "The Messenger of Allah, may Allah bless him and grant him peace, used to command us to fast the white days: the thirteenth, fourteenth and fifteenth." [Abu Dawud]

1264. Ibn 'Abbas said, "The Messenger of Allah, may Allah bless him and grant him peace, did not fail to fast the white days either when at home or on a journey." [an-Nasa'i]