Sahih Muslim Book: 14, Hadith: 2731

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنِ ابْنِ عَوْنٍ، عَنْ زِيَادِ بْنِ جُبَيْرٍ، قَالَ جَاءَ رَجُلٌ إِلَى ابْنِ عُمَرَ – رضى الله عنهما – فَقَالَ إِنِّي نَذَرْتُ أَنْ أَصُومَ يَوْمًا فَوَافَقَ يَوْمَ أَضْحَى أَوْ فِطْرٍ ‏.‏ فَقَالَ ابْنُ عُمَرَ رضى الله عنهما أَمَرَ اللَّهُ تَعَالَى بِوَفَاءِ النَّذْرِ وَنَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ صَوْمِ هَذَا الْيَوْمِ ‏.‏ Ziyad b. Jubair reported that a person came to Ibn ‘Umar (Allah be pleased with them) and said: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 (may peace be upon him) has forbidden the observance of fast on this day. Chain : Abu Bakr bin Abi Shayba – Waki’ bin al-Jarrah – ‘Abdullah bin ‘Awn bin Artaban – Ziyad bin ...