(50) باب مَا جَاءَ عَاشُورَاءُ أَىُّ يَوْمٍ هُوَ
Al-Hakam bin Al-Arfaj said:
"I met up with Ibn Abbas while he was reclining on his Rida at the Zamzam (well). So I said: 'Inform me about the Day of Ashura. On which day is it fasted?' He said: 'When you see the crescent of Al-Muharram, then count, then fast on the morning of the ninth day.'" He said: 'I said: Is this how Muhammad fasted it?' He said: 'Yes.'" (FR)
Reference (FR): Jami` at-Tirmidhi 754 (FR)
In-book reference (FR): Book 8, Hadith 73 (FR)
English translation (FR): Vol. 2, Book 3, Hadith 754 (FR)