Narrated Abu Sa’id Al Khudri : The Messenger of Allah (ﷺ) forbade fasting on two days, al-Fitr (breaking the fast of Ramadan) and al-Adha (the day of sacrifice), and wearing a tight single garment the raising of which discloses private parts, and sitting with one's legs drawn up and wrapped in one's garment, and forbade praying at two hours, after the Fajr prayer and after the Asr prayer.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا عَمْرُو بْنُ يَحْيَى، عَنْ أَبِيهِ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ صِيَامِ يَوْمَيْنِ يَوْمِ الْفِطْرِ وَيَوْمِ الأَضْحَى وَعَنْ لِبْسَتَيْنِ الصَّمَّاءِ وَأَنْ يَحْتَبِيَ الرَّجُلُ فِي الثَّوْبِ الْوَاحِدِ وَعَنِ الصَّلاَةِ فِي سَاعَتَيْنِ بَعْدَ الصُّبْحِ وَبَعْدَ الْعَصْرِ .
sunnah.com