The Messenger of Allah ﷺ forbade fasting on two days, the day of Fitr and the day of Adha. He also forbade two styles of dress, the Samma wrap and a man sitting wrapped in a single garment with his knees drawn up. And he forbade prayer at two times, after the dawn prayer and after the afternoon prayer.
حدثنا موسى بن إسمعيل حدثنا وهيب حدثنا عمرو بن يحيى عن أبيه
نهى رسول الله ﷺ عن صيام يومين يوم الفطر ويوم الأضحى وعن لبستين الصماء وأن يحتبي الرجل في الثوب الواحد وعن الصلاة في ساعتين بعد الصبح وبعد العصر
Related by Bukhari in the Book of Fasting, Chapter on Fasting the Day of Eid al-Fitr, no. 1991, 1992, from the hadith of Wahib, and by Muslim in the Book of Fasting, Chapter on the Prohibition of Fasting on the Two Days of Eid, no. 827/140, after no. 1138, from the hadith of Amr bin Yahya.