Hakam bin A'raj says: I went to Sayyiduna Abdullah bin Abbas (may Allah be pleased with him), while he was sitting leaning near the well of Zamzam. I also sat with him; he was the best companion. I asked: Tell me about the Day of Ashura. He said: Which aspect of it do you want to ask about? I said: About the fasting of that day. He said: When you see the crescent of the month of Muharram, keep counting the dates; when the morning of the 9th of Muharram comes, fast on that day. I asked: Did Muhammad (peace and blessings be upon him) also fast in this way? He said: Yes.

. (Second chain of narration) In this it is stated: When you see the crescent of the month of Muharram, then keep counting until the ninth of Muharram, and on the morning of the ninth of Muharram, observe the fast. The rest of the hadith is the same as mentioned above.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: If I remain alive until next year, I will surely fast on the ninth of Muharram.

Narrated by Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Observe fasting on the Day of Ashura, but oppose the Jews in this matter, and that is by fasting a day before it or a day after it.