Narrated `Aisha:
The people used to fast on 'Ashura (the tenth day of the month of Muharram) before the fasting of Ramadan was made obligatory. And on that day the Ka`ba used to be covered with a cover. When Allah made the fasting of the month of Ramadan compulsory, Allah's Messenger (ﷺ) said, "Whoever wishes to fast (on the day of 'Ashura') may do so; and whoever wishes to leave it can do so."
Reference | : Sahih al-Bukhari 1592 |
In-book reference | : Book 25, Hadith 78 |
USC-MSA web (English) reference | : Vol. 2, Book 26, Hadith 662 |
(deprecated numbering scheme) |