Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:8414Abū ʿAbdullāh al-Ḥāfiẓ > Makhlad b. Jaʿfar al-Bāqarḥī > Muḥammad b. Ṭāhir b. Abū al-Dumayk > ʿAlī b. al-Madīnī > Ḥammād b. Usāmah > Abū al-ʿUmays > Qays b. Muslim > Ṭāriq b. Shihāb

[Machine] Abu Musa al-Ash'ari said, "The day of Ashura is a day that the Jews hold in high regard and consider it a festive day." So the Messenger of Allah ﷺ said, "Therefore, fast on that day."  

البيهقي:٨٤١٤أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنبأ مَخْلَدُ بْنُ جَعْفَرٍ الْبَاقَرْحِيُّ ثنا مُحَمَّدُ بْنُ طَاهِرِ بْنِ أَبِي الدُّمَيْكِ ثنا عَلِيُّ بْنُ الْمَدِينِيِّ ثنا حَمَّادُ بْنُ أُسَامَةَ عَنْ أَبِي الْعُمَيْسِ عَنْ قَيْسِ بْنِ مُسْلِمٍ عَنْ طَارِقِ بْنِ شِهَابٍ قَالَ

قَالَ أَبُو مُوسَى الْأَشْعَرِيُّ كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تُعَظِّمُهُ الْيَهُودُ وَتَتَّخِذُهُ عِيدًا فَقَالَ رَسُولُ اللهِ ﷺ فَصُومُوهُ أَنْتُمْ  

رَوَاهُ الْبُخَارِيُّ فِي الصَّحِيحِ عَنْ عَلِيِّ بْنِ الْمَدِينِيِّ وَرَوَاهُ مُسْلِمٌ عَنْ أَبِي بَكْرِ بْنِ أَبِي شَيْبَةَ عَنْ أَبِي أُسَامَةَ حَمَّادِ بْنِ أُسَامَةَ