Sunan Abi Dawud, Hadith 2412

Abu Murrah, the client of Umm Hani, entered along with 'Abd Allah b. 'Amr upon his father 'Amr b. 'As and he brought food for him. He said: Eat. He said: I am fasting. 'Amr said: Eat, these are the days on which the Messenger of Allah used to command us to break fast, and forbid us to keep fast. The narrator Malik said: These are the day of al-tashriq (i.e. 11th, 12th, and 13th of Dhu al-Hijjah).

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ الْقَعْنَبِيُّ، عَنْ مَالِكٍ، عَنْ يَزِيدَ بْنِ الْهَادِ، عَنْ أَبِي مُرَّةَ، مَوْلَى أُمِّ هَانِئٍ أَنَّهُ دَخَلَ مَعَ عَبْدِ اللَّهِ بْنِ عَمْرٍو عَلَى أَبِيهِ عَمْرِو بْنِ الْعَاصِ فَقَرَّبَ إِلَيْهِمَا طَعَامًا فَقَالَ كُلْ ‏.‏ فَقَالَ إِنِّي صَائِمٌ ‏.‏ فَقَالَ عَمْرٌو كُلْ فَهَذِهِ الأَيَّامُ الَّتِي كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَأْمُرُنَا بِإِفْطَارِهَا وَيَنْهَانَا عَنْ صِيَامِهَا ‏.‏ قَالَ مَالِكٌ وَهِيَ أَيَّامُ التَّشْرِيقِ ‏.‏

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also referenced under: Hadith 2418 (DarusSalam)