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:2-1686bʿUmar Nnah Arsal > al-Ḥārith b. Hishām > Ghad Ywm ʿĀshūrāʾ Faṣum And ʾMur Hlak
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السيوطي:٢-١٦٨٦b

"عَنْ عُمَرَ أنَّهُ أَرْسَلَ إِلَى الْحَارِثِ بْنِ هِشَامٍ أَنَّ غَدًا يومُ عَاشُورَاء فَصُمْ وَأمُرْ أهْلَكَ أَنْ يَصُومُوا".  

مالك، وابن جرير