Hadith
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، عَنْ شُعْبَةَ، قَالَ أَنْبَأَنَا أَنَسُ بْنُ سِيرِينَ، عَنْ رَجُلٍ، يُقَالُ لَهُ عَبْدُ الْمَلِكِ يُحَدِّثُ عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَأْمُرُ بِهَذِهِ الأَيَّامِ الثَّلاَثِ الْبِيضِ وَيَقُولُ " هُنَّ صِيَامُ الشَّهْرِ " .
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It was narrated that a man called 'Abdul-Malik narrated from his father, that:the Messenger of Allah used to enjoin (fasting) these days of Al-Bid and he said: "That is (equivalent to) fasting for the whole month
Da'if · Abu Ghuddah
Sunan an-Nasa'i 2430 ·Book 22, Hadith 341·Also available on sunnah.com·