Narrated by:a man called 'Abdul-Malik narrated from his father
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."
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 " .
Nesai
The Book of Fasting • Hadith 2430