(65) باب فِي صَوْمِ يَوْمِ عَاشُورَاءَ
Ibn 'Abbas said:
When the Prophet (ﷺ) came to Medina, he found the Jews observing fast on the day of 'Ashurah; so they were asked about it (by the Prophet). They said: This is a day on which Allah gave Moses domination over Pharaoh. We fast on it out of reverence to him. The Messenger of Allah (ﷺ) said: We have a closer connection with Moses than you have. He then gave orders that it should be observed.
Reference: Sunan Abi Dawud 2444
In-book reference: Book 14, Hadith 132
English translation: Book 13, Hadith 2438