English translation
2442. 'Aishah said: "The day of 'Ashūrā' was a day that the people of Quraish used to fast during Jāhiliyyah (the days of pre-Islamic Ignorance), and the Messenger of Allāh ﷺ used to fast it in Jāhiliyyah. When the Messenger of Allāh ﷺ arrived in Al-Madīnah, he fasted it and ordered others to fast it. When fasting in Ramaḍān was enjoined, it became the obligation, and 'Ashūrā' was abandoned. Whoever wanted to, he would fast, and whoever wanted to, he would leave it." (Saḥih)
