It wasnarrated from Muhammad bin Saifi that the Messenger of Allah(ﷺ)said to us on the Day of 'Ashura':
"Has anyone among you eatentoday?" We said: "Some of us have eaten and some of us have not."Hesaid: "Complete the rest of your day (i.e., do not eat for therest ofthe day), whoever has eaten and whoever has not eaten. Andsend wordto the people of the suburbs to complete the rest of theirday." Hewas referring to the people of the suburbs aroundAl-Madinah.
English reference: Vol. 1, Book 7, Hadith 1735
Arabic reference: Book 7, Hadith 1807