510
Musnad AhmedIt was narrated that Abu ‘Ubaid, the freed slave of "AbdurRahman bin Azhar, said:
l saw "Ali (رضي الله عنه) and "Uthman (رضي الله عنه) on the day of Eid al-Fitr and Eid al-Adha; they prayed, then when they finished they reminded the people. I heard them saying: The Messenger of Allah (ﷺ) forbade fasting on these two days. He said: And I heard ‘Ali say: The Messenger of Allah (ﷺ) forbade anything of the sacrificial meat to be left after three days.
Reference: Musnad Ahmad 510
Arabic/English book : Book 4, Hadith 510
Arabic/English book : Book 4, Hadith 510