[Machine] Does it come upon him on a day he fasts on it, but that happens to be either the day of sacrifice or the day of breaking the fast? Ibn 'Umar replied, "Indeed you have in the Messenger of Allah a good example." (Al-Ahzab 21) The Messenger of Allah ﷺ did not fast on the day of sacrifice or the day of breaking the fast, nor did he command to fast on both of them.  

يَأْتِيَ عَلَيْهِ يَوْمٌ سَمَّاهُ إِلَّا وَهُوَ صَائِمٌ فِيهِ فَوَافَقَ ذَلِكَ يَوْمَ أَضْحَى أَوْ يَوْمَ فِطْرٍ؟ فَقَالَ ابْنُ عُمَرَ ؓ {لَقَدْ كَانَ لَكُمْ فِي رَسُولِ اللهِ أُسْوَةٌ حَسَنَةٌ} [الأحزاب 21] لَمْ يَكُنْ رَسُولُ اللهِ ﷺ يَصُومُ يَوْمَ الْأَضْحَى وَلَا يَوْمَ الْفِطْرِ وَلَا يَأْمُرُ بِصِيَامِهِمِا  

[Machine] Abu Bakr al-Isma'ili reported that Yusuf the qadi informed us, narrating from Muhammad ibn al-Minhali, who narrated from Yazid ibn Zurai, who narrated from Yunus ibn Ubayd, who reported that Ziyad ibn Jubayr said: "I was with Ibn Umar, and a man came to him and said, 'I have vowed to fast every Tuesday or Wednesday for the rest of my life. Should I observe this fast on the day of sacrifice?' Ibn Umar replied, 'Indeed, Allah has commanded us to fulfill our vows, but we have been forbidden from fasting on this day.' The man seemed confused, so Ibn Umar repeated his statement, saying, 'Indeed, Allah has commanded us to fulfill our vows, but we have been forbidden from fasting on this day.' Yunus said, 'So, I mentioned this to Al-Hasan, and he said, 'He should fast on another day in its place.'  

أنبأ أَبُو بَكْرٍ الْإِسْمَاعِيلِيُّ أنبأ يُوسُفُ الْقَاضِي ثنا مُحَمَّدُ بْنُ الْمِنْهَالِ ثنا يَزِيدُ بْنُ زُرَيْعٍ ثنا يُونُسُ بْنُ عُبَيْدٍ عَنْ زِيَادِ بْنِ جُبَيْرٍ قَالَ كُنْتُ عِنْدَ ابْنِ عُمَرَ ؓ فأَتَاهُ رَجُلٌ فَقَالَ إِنِّي نَذَرْتُ أَنْ أَصُومَ كُلَّ ثُلَاثَاءَ أَوْ أَرْبِعَاءَ مَا عِشْتُ فَإِنْ وَافَقْتُ هَذَا الْيَوْمَ يَوْمَ نَحْرٍ؟ فَقَالَ ابْنُ عُمَرَ ؓ إِنَّهُ قَدْ أَمَرَ اللهُ بِوَفَاءِ النَّذْرِ وَنُهِينَا أَنْ نَصُومَ هَذَا الْيَوْمَ قَالَ فَخُيِّلَ إِلَى الرَّجُلِ أَنَّهُ لَمْ يَفْهَمْ فَأَعَادَ عَلَيْهِ الْكَلَامَ الثَّانِيَةَ فَقَالَ ابْنُ عُمَرَ ؓ قَدْ أَمَرَ اللهُ بِوَفَاءِ النَّذْرِ وَنُهِينَا عَنْ صِيَامِ هَذَا الْيَوْمِ قَالَ يُونُسُ فَذَكَرْتُ ذَلِكَ لِلْحَسَنِ فَقَالَ يَصُومُ يَوْمًا مَكَانَهُ