English translation
4502. Narrated ‘Āishah رضي الله عنها: The people used to fast on the day of ‘Āshūrā’ before the fasting in Ramaḍān was prescribed, but when (the order of observing compulsory fasting in) Ramaḍān was revealed, it was up to one to fast on it (i.e., ‘Āshūrā’) or not.
