Sahih Muslim Book: 14, Hadith: 2700

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا لَيْثٌ، ح وَحَدَّثَنَا ابْنُ رُمْحٍ، أَخْبَرَنَا اللَّيْثُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، رضى الله عنهما أَنَّهُ ذُكِرَ عِنْدَ رَسُولِ اللَّهِ صلى الله عليه وسلم يَوْمُ عَاشُورَاءَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ “‏ كَانَ يَوْمًا يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَصُومَهُ فَلْيَصُمْهُ وَمَنْ كَرِهَ فَلْيَدَعْهُ ‏”‏ ‏.‏ Ibn ‘Umar (Allah be pleased with them) said that the day of ‘Ashura was mentioned before the Messenger of Allah (may peace he upon him). Thereupon the Messenger of Allah, (may peace be upon him) said:That was a day on which the people of pre-Islamic days used to observe fast. So he who amongst you likes to observe fast should do so, and he who does not like it should abandon it. Chain : Qutayba bin Sa’id bin Jamil – al-Laith bin Sa’d – Muhammad bin Rmh bin al-Mhajr – al-Laith bin Sa’d – Nafie’ – ibn Uma...