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.
ahmad:14663Ḥasan > Ibn Lahīʿah > Abū al-Zubayr > Jābir

[Machine] He said: The Messenger of Allah ﷺ commanded us to fast on the day of Ashura and he said: It is a day that the Jews used to fast.  

أحمد:١٤٦٦٣حَدَّثَنَا حَسَنٌ أَخْبَرَنَا ابْنُ لَهِيعَةَ أَخْبَرَنَا أَبُو الزُّبَيْرِ عَنْ جَابِرٍ

أَنَّهُ قَالَ أَمَرَنَا رَسُولُ اللهِ ﷺ بِيَوْمِ عَاشُورَاءَ أَنْ نَصُومَهُ وَقَالَ هُوَ يَوْمٌ كَانَتِ الْيَهُودُ تَصُومُهُ