Narrated Abu `Ubaid
(the slave of Ibn Azhar) I witnessed the `Id with `Umar bin Al-Khattab who said, Allah's Messenger (ﷺ) has forbidden people to fast on the day on which you break fasting (the fasts of Ramadan) and the day on which you eat the meat of your sacrifices (the first day of `Id ul Fitr and `Id ul-Adha).
Narrated Abu Sa`id
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.