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.
suyuti:16327a
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السيوطي:١٦٣٢٧a

"قدْ كان عَاشورَاءُ يَوْمٌ يَصُومُه الْيَهودُ وَيَتَّخِذُونهُ عِيدًا فصُومُوه أَنْتُمْ".  

[طب] الطبرانى في الكبير عن أبي موسى

See similar narrations below:

Collected by Muslim, Aḥmad
muslim:1131aAbū Bakr b. Abū Shaybah And Ibn Numayr > Abū Usāmah > Abū ʿUmays > Qays b. Muslim > Ṭāriq b. Shihāb > Abū Mūsá

The day of 'Ashura was one which the Jews respected and they treated it as Id. The Messenger of Allah ﷺ said: You also observe fast on this day.  

مسلم:١١٣١aوَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَابْنُ نُمَيْرٍ قَالاَ حَدَّثَنَا أَبُو أُسَامَةَ عَنْ أَبِي عُمَيْسٍ عَنْ قَيْسِ بْنِ مُسْلِمٍ عَنْ طَارِقِ بْنِ شِهَابٍ عَنْ أَبِي مُوسَى ؓ قَالَ

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تُعَظِّمُهُ الْيَهُودُ وَتَتَّخِذُهُ عِيدًا فَقَالَ رَسُولُ اللَّهِ ﷺ صُومُوهُ أَنْتُمْ  

ahmad:19669Abū Usāmah > Abū al-ʿUmays > Qays b. Muslim > Ṭāriq b. Shihāb > Abū Mūsá

The day of 'Ashura was one which the Jews respected and they treated it as Id. The Messenger of Allah ﷺ said: You also observe fast on this day. (Using translation from Muslim 1131a)  

أحمد:١٩٦٦٩حَدَّثَنَا أَبُو أُسَامَةَ حَدَّثَنِي أَبُو الْعُمَيْسِ عَنْ قَيْسِ بْنِ مُسْلِمٍ عَنْ طَارِقِ بْنِ شِهَابٍ عَنْ أَبِي مُوسَى قَالَ

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ الْيَهُودُ تَتَّخِذُهُ عِيدًا فَقَالَ رَسُولُ اللهِ ﷺ صُومُوهُ أَنْتُمْ