(65) باب فِي صَوْمِ يَوْمِ عَاشُورَاءَ
Ibn 'Umar said:
'Ashurah was a day on which we used to fast in pre-Islamic days. When (fasting of) Ramadan was prescribed, the Messenger of Allah (ﷺ) said: This is one of the days of Allah ; he who wishes may fast on it.
Reference: Sunan Abi Dawud 2443
In-book reference: Book 14, Hadith 131
English translation: Book 13, Hadith 2437