Sahih Bukhari 6706

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ ، عَنْ يُونُسَ ، عَنْ زِيَادِ بْنِ جُبَيْرٍ ، قَالَ : كُنْتُ مَعَ ابْنِ عُمَرَ ، فَسَأَلَهُ رَجُلٌ ، فَقَالَ : نَذَرْتُ أَنْ أَصُومَ كُلَّ يَوْمِ ثَلَاثَاءَ ، أَوْ أَرْبِعَاءَ مَا عِشْتُ ، فَوَافَقْتُ هَذَا الْيَوْمَ يَوْمَ النَّحْرِ ، فَقَالَ : أَمَرَ اللَّهُ بِوَفَاءِ النَّذْرِ ، وَنُهِينَا أَنْ نَصُومَ يَوْمَ النَّحْرِ ، فَأَعَادَ عَلَيْهِ ، فَقَالَ : مِثْلَهُ لَا يَزِيدُ عَلَيْهِ .

Narrated Ziyad bin Jubair: I was with Ibn `Umar when a man asked him, I have vowed to fast every Tuesday or Wednesday throughout my life and if the day of my fasting coincided with the day of Nahr (the first day of `Id-al- Adha), (What shall I do?) Ibn `Umar said, Allah has ordered the vows to be fulfilled, and we are forbidden to fast on the day of Nahr. The man repeated his question and Ibn `Umar repeated his former answer, adding nothing more.