حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ، أَنْبَأَنَا اللَّيْثُ بْنُ سَعْدٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ ذُكِرَ عِنْدَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ يَوْمُ عَاشُورَاءَ فَقَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " كَانَ يَوْمًا يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَصُومَهُ فَلْيَصُمْهُ وَمَنْ كَرِهَهُ فَلْيَدَعْهُ " .
It wasnarrated from ‘Abdullah bin ‘Umar that the Day of ‘Ashura’wasmentioned in the presence of the Messenger of Allah (PBUH). TheMessenger of Allah (PBUH) said: “That was a day when the people oftheIgnorance used to fast. So whoever among you wants to fast may doso,and whoever does not want to may leave it.” Translation Not Available
Book Ref: Sunan Ibn Majah Book 7 Hadith 1737
Web Ref: Sunan Ibn Majah Vol 1 Book 7 Hadith 1737