Muwatta Malik #688
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، أَرْسَلَ إِلَى الْحَارِثِ بْنِ هِشَامٍ أَنَّ غَدًا، يَوْمُ عَاشُورَاءَ فَصُمْ وَأْمُرْ أَهْلَكَ أَنْ يَصُومُوا .
Yahya related to me from Malik that he had heard that Umar ibn
al-Khattab had sent (the following message) to al-Harith ibn Hisham,
''Tomorrow is the day of Ashura, so fast (it) and tell your family to
fast (also)."
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About Muwatta Malik
This hadith is #688 from Muwatta Malik, in the Book of Fasting.