Jami` at-Tirmidhi 3044
Narrated 'Ammar bin Abi 'Ammar:
"Ibn Abbas recited: This day, I have perfected your religion for you, completed My favor upon you, and have chosen for you Islam as your religion (5:3). And a Jew was with him who said: 'If this Ayah was revealed to us then we would have taken that day as a day of celebration.' So Ibn 'Abbas said: 'Indeed it was revealed on two 'Eids: On Friday, and on the Day of 'Arafah.'"
حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، أَخْبَرَنَا يَزِيدُ بْنُ هَارُونَ، أَخْبَرَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ عَمَّارِ بْنِ أَبِي عَمَّارٍ، قَالَ قَرَأَ ابْنُ عَبَّاسٍ ‏:‏ ‏(‏ الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الإِسْلاَمَ دِينًا ‏)‏ وَعِنْدَهُ يَهُودِيٌّ فَقَالَ لَوْ أُنْزِلَتْ هَذِهِ عَلَيْنَا لاَتَّخَذْنَا يَوْمَهَا عِيدًا ‏.‏ قَالَ ابْنُ عَبَّاسٍ فَإِنَّهَا نَزَلَتْ فِي يَوْمِ عِيدٍ فِي يَوْمِ جُمُعَةٍ وَيَوْمِ عَرَفَةَ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ مِنْ حَدِيثِ ابْنِ عَبَّاسٍ وَهُوَ صَحِيحٌ ‏.‏