عَنْ أَبِي عُبَيْدٍ قَالَ: شَهِدْتُّ الْعِيدَ مَعَ عُمَرَ (بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ) فَبَدَأَ بِالصَّلَاةِ قَبْلَ الْخُطْبَةِ، وَقَالَ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ نَهَى عَنْ صِيَامِ هَذَيْنِ الْيَوْمَيْنِ، أَمَّا يَوْمُ الْفِطْرِ فَفِطْرُكُمْ مِنْ صَوْمِكُمْ، وَأَمَّا يَوْمُ الْأَضْحَى فَكُلُوا مِنْ نُسُكِكُمْ
Abu Ubaid says: On the occasion of Eid, I was present with Sayyiduna Umar bin Khattab (may Allah be pleased with him). He led the prayer before the sermon and said: The Messenger of Allah (peace and blessings be upon him) forbade fasting on these two days of Eid. (The reason is that) Eid al-Fitr is the day of breaking your fast after (a month of) fasting, and Eid al-Adha is the day of sacrifice, so eat the meat of sacrifice on it.