I heard from him (Abu Sa'id) a hadith which impressed me, and I said to him: Did you hear it from the Messenger of Allah (ﷺ)? Thereupon he said: (Is it possible) that (I should) say about the Messenger of Allah (ﷺ) that which I have not heard? I heard him saying: It is not proper to fast on two days, Adha and Fitr (at the end) of Ramadan.
Reported by Muslim (No. 827b) and Ahmad (No. 11059).
I witnessed Eid with ‘Umar ibn al-Khattāb (may Allah be pleased with him), and he said: These are two days that the Messenger of Allah (may Allah's peace and blessings be upon him) forbade fasting: the day of breaking your fast, and the other day in which you eat from your sacrifice.
شَهِدْتُ الْعِيدَ مَعَ عُمَرَ بْنِ الْخَطَّابِ ـ رضى الله عنه ـ فَقَالَ هَذَانِ يَوْمَانِ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ صِيَامِهِمَا يَوْمُ فِطْرِكُمْ مِنْ صِيَامِكُمْ، وَالْيَوْمُ الآخَرُ تَأْكُلُونَ…