Sahih al-Bukhari 1991
Sahih al-Bukhari · Book 30: Fasting · Observing Saum on the first day of 'Eid-ul-Fitr.
Narrated Abu Sa`id:
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ ، حَدَّثَنَا وُهَيْبٌ ، حَدَّثَنَا عَمْرُو بْنُ يَحْيَى ، عَنْ أَبِيهِ ، عَنْ أَبِي سَعِيدٍ ـ رضى الله عنه ـ قَالَ نَهَى النَّبِيُّ صلى الله عليه وسلم عَنْ صَوْمِ يَوْمِ الْفِطْرِ وَالنَّحْرِ، وَعَنِ الصَّمَّاءِ، وَأَنْ يَحْتَبِيَ الرَّجُلُ فِي ثَوْبٍ وَاحِدٍ. وَعَنْ صَلاَةٍ، بَعْدَ الصُّبْحِ وَالْعَصْرِ.
The Prophet (ﷺ) forbade the fasting of `Id-ul-Fitr and `Id-ul-Adha (two feast days) and also the wearing of As-Samma' (a single garment covering the whole body), and sitting with one's leg drawn up while being wrapped in one garment. He also forbade the prayers after the Fajr (morning) and the `Asr (afternoon) prayers.