Sahih al-Bukhari Hadith 172 – Volume 5, Book 58

English

Volume 5, Book 58, Number 172:
Narrated 'Aisha:
'Ashura' (i.e. the tenth of Muharram) was a day on which the tribe of Quraish used to fast in the
pre-lslamic period of ignorance. The Prophet also used to fast on this day. So when he migrated to
Medina, he fasted on it and ordered (the Muslims) to fast on it. When the fasting of Ramadan was
enjoined, it became optional for the people to fast or not to fast on the day of Ashura.