Fasting (Kitab Al-Siyam)
14/69. Chapter:
Regarding Fasting Three Days Every Month
Sunan Abi Dawud
حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، حَدَّثَنَا هَمَّامٌ، عَنْ أَنَسٍ، أَخِي مُحَمَّدٍ عَنِ ابْنِ مِلْحَانَ الْقَيْسِيِّ، عَنْ أَبِيهِ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَأْمُرُنَا أَنْ نَصُومَ الْبِيضَ ثَلاَثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ . قَالَ وَقَالَ " هُنَّ كَهَيْئَةِ الدَّهْرِ " .
Narrated Qatadah Ibn Malhan al-Qaysi: The Messenger of Allah (ﷺ) used to command us to fast the days of the white (nights): thirteenth, fourteenth and fifteenth of the month. He said: This is like keeping perpetual fast.
Reference : Sunan Abi Dawud 2449In-book reference : Book 14, Hadith 137English translation : Book 13, Hadith 2443