I observed Id along with Umar b. al-Khattab (Allah be pleased with him). He came (out in an open space) and prayed and (after) completing it addressed the people and said: The Messenger of Allah ﷺ has forbidden the observing of fast on these two days. One is the day of Fitr (at the end of your fasts), and the second one, the day when you eat (the meat) of your sacrifices.  

إِنَّ هَذَيْنِ يَوْمَانِ نَهَى رَسُولُ اللَّهِ ﷺ عَنْ صِيَامِهِمَا يَوْمُ فِطْرِكُمْ مِنْ صِيَامِكُمْ وَالْآخَرُ يَوْمٌ تَأْكُلُونَ فِيهِ مِنْ نُسُكِكُمْ  

Abu Huraira (Allah be pleased with him) reported that the Messenger of Allah ﷺ forbade fasting on these two days. 'Id-ul-Adha and 'Id-ul-Fitr.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنْ صِيَامِ يَوْمَيْنِ يَوْمِ الأَضْحَى وَيَوْمِ الْفِطْرِ  

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.  

سَمِعْتُ مِنْهُ حَدِيثًا فَأَعْجَبَنِي فَقُلْتُ لَهُ آنْتَ سَمِعْتَ هَذَا مِنْ رَسُولِ اللَّهِ ﷺ قَالَ فَأَقُولُ عَلَى رَسُولِ اللَّهِ ﷺ مَا لَمْ أَسْمَعْ قَالَ سَمِعْتُهُ يَقُولُ لاَ يَصْلُحُ الصِّيَامُ فِي يَوْمَيْنِ يَوْمِ الأَضْحَى وَيَوْمِ الْفِطْرِ مِنْ رَمَضَانَ  

Abu Sa'id al-Khudri (Allah be pleased with him) reported that the Messenger of Allah ﷺ forbade to observe fast on two days the day of Fitr and the day of Sacrifice ('Id-ul-Adha).  

عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ؓ أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنْ صِيَامِ يَوْمَيْنِ يَوْمِ الْفِطْرِ وَيَوْمِ النَّحْرِ  

I had taken a vow that I would fast on the day (but it accidentally) synchronises with the day of Adha or the day of Fitr. Thereupon Ibn 'Umar (Allah be pleased with him) said: Allah, the Exalted, has commanded fulfilling of the vow, but the Messenger of Allah ﷺ has forbidden the observance of fast on this day.  

أَنْ أَصُومَ يَوْمًا فَوَافَقَ يَوْمَ أَضْحَى أَوْ فِطْرٍ فَقَالَ ابْنُ عُمَرَ ؓ أَمَرَ اللَّهُ تَعَالَى بِوَفَاءِ النَّذْرِ وَنَهَى رَسُولُ اللَّهِ ﷺ عَنْ صَوْمِ هَذَا الْيَوْمِ  

'A'isha (Allah be pleased with her) said that the Prophet ﷺ forbade to observe fast on two days-the day of Fitr and the day of Adha.  

نَهَى رَسُولُ اللَّهِ ﷺ عَنْ صَوْمَيْنِ يَوْمِ الْفِطْرِ وَيَوْمِ الأَضْحَى