(the slave of Ibn Azhar) I witnessed the ʿId with ʿUmar bin Al-Khattab who said, Messenger of Allah ﷺ has forbidden people to fast on the day on which you break fasting (the fasts of Ramadan) and the day on which you eat the meat of your sacrifices (the first day of ʿId ul Fitr and ʿId ul-Adha).  

شَهِدْتُ الْعِيدَ مَعَ عُمَرَ بْنِ الْخَطَّابِ ؓ فَقَالَ: هَذَانِ يَوْمَانِ نَهَى رَسُولُ اللَّهِ ﷺ عَنْ صِيَامِهِمَا يَوْمُ فِطْرِكُمْ مِنْ صِيَامِكُمْ وَالْيَوْمُ الآخَرُ تَأْكُلُونَ فِيهِ مِنْ نُسُكِكُمْ۔  

(freed slave of) Ziyad: I heard Abu Saʿid Al-khudri narrating four things from the Prophet ﷺ and I appreciated them very much. He said, conveying the words of the Prophet. (1) "A woman should not go on a two day journey except with her husband or a Dhi-Mahram. (2) No fasting is permissible on two days: ʿId-ul-Fitr and ʿId-ul-Adha. (3) No prayer after two prayers, i.e. after the Fajr prayer till the sunrises and after the ʿAsr prayer till the sun sets. (4) Do not prepare yourself for a journey except to three Mosques, i.e. Al-Masjid-AI-Haram, the Mosque of Aqsa (Jerusalem) and my Mosque."  

سَمِعْتُ أَبَا سَعِيدٍ الْخُدْرِيَّ ؓ يُحَدِّثُ بِأَرْبَعٍ عَنِ النَّبِيِّ ﷺ فَأَعْجَبْنَنِي وَآنَقْنَنِي قَالَ: «(١) لاَ تُسَافِرِ الْمَرْأَةُ يَوْمَيْنِ إِلاَّ مَعَهَا زَوْجُهَا أَوْ ذُو مَحْرَمٍ، (٢) وَلاَ صَوْمَ فِي يَوْمَيْنِ الْفِطْرِ وَالأَضْحَى، (٣) وَلاَ صَلاَةَ بَعْدَ صَلاَتَيْنِ بَعْدَ الصُّبْحِ حَتَّى تَطْلُعَ الشَّمْسُ وَبَعْدَ الْعَصْرِ حَتَّى تَغْرُبَ، (٤) وَلاَ تُشَدُّ الرِّحَالُ إِلاَّ إِلَى ثَلاَثَةِ مَسَاجِدَ: مَسْجِدِ الْحَرَامِ، وَمَسْجِدِ الأَقْصَى، وَمَسْجِدِي۔»  

A man went to Ibn ʿUmar I. and said, "A man vowed to fast one day (the sub-narrator thinks that he said that the day was Monday), and that day happened to be ʿId day." Ibn ʿUmar said, "Allah orders vows to be fulfilled and the Prophet ﷺ forbade the fasting on this day (i.e. Id).  

جَاءَ رَجُلٌ إِلَى ابْنِ عُمَرَ ؓ فَقَالَ رَجُلٌ نَذَرَ أَنْ يَصُومَ يَوْمًا قَالَ أَظُنُّهُ قَالَ الاِثْنَيْنِ فَوَافَقَ يَوْمَ عِيدٍ فَقَالَ ابْنُ عُمَرَ أَمَرَ اللَّهُ بِوَفَاءِ النَّذْرِ وَنَهَى النَّبِيُّ ﷺ عَنْ صَوْمِ هَذَا الْيَوْمِ