"I witnessed Umar bin Al-Khattab on the Day of Nahr beginning with the Salat before the Khutbah. Then he said: 'I heard the Messenger of Allah prohibit fasting on these two days. As for the Day of Fitr, then it is for you to take a break from your fasting, and a celebration for the Muslims. As for the Day of Adha, then eat from the flesh that you have sacrificed.'"  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَنْهَى عَنْ صَوْمِ هَذَيْنِ الْيَوْمَيْنِ أَمَّا يَوْمُ الْفِطْرِ فَفِطْرُكُمْ مِنْ صَوْمِكُمْ وَعِيدٌ لِلْمُسْلِمِينَ وَأَمَّا يَوْمُ الأَضْحَى فَكُلُوا مِنْ لُحُومِ نُسُكِكُمْ قَالَ هَذَا حَدِيثٌ صَحِيحٌ وَأَبُو عُبَيْدٍ مَوْلَى عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ اسْمُهُ سَعْدٌ وَيُقَالُ لَهُ مَوْلَى عَبْدِ الرَّحْمَنِ بْنِ أَزْهَرَ أَيْضًا وَعَبْدُ الرَّحْمَنِ بْنُ أَزْهَرَ هُوَ ابْنُ عَمِّ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ  

"The Messenger of Allah prohibited two fasts: Fasting the Day of Adha and the Day of Fitr."  

نَهَى رَسُولُ اللَّهِ ﷺ عَنْ صِيَامَيْنِ يَوْمِ الأَضْحَى وَيَوْمِ الْفِطْرِ قَالَ وَفِي الْبَابِ عَنْ عُمَرَ وَعَلِيٍّ وَعَائِشَةَ وَأَبِي هُرَيْرَةَ وَعُقْبَةَ بْنِ عَامِرٍ وَأَنَسٍ