Jami` at-Tirmidhi 772
جامع الترمذي#772SahihAbu Sa'eed Al-Khudri narrated:"The Messenger of Allah prohibited two fasts: Fasting the Day of Adha and the Day of Fitr
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 8:91