When is the Day of Ashura fasted?

Question:
When does the fasting of the month of Muharram, or the fasting of Ashura, begin? Does it start at the beginning of Muharram, in the middle, or at the end? And how many days are fasted? Because I have heard that the fasting of Ashura begins from the 1st of Muharram to the 10th of Muharram? May Allah guide you.

Answer:
The Prophet (peace and blessings be upon him) said: and it is Ashura. The meaning is that one fasts the whole of it, from its beginning to its end, from its first day to its last. This is the meaning of the hadith. However, the 9th and 10th, or the 10th and 11th, are specified for those who do not fast the whole of it. The Prophet (peace and blessings be upon him) used to fast Ashura in the pre-Islamic age of ignorance, and the Quraysh also used to fast it. When he (peace and blessings be upon him) arrived in Madinah, he found the Jews fasting it. He asked them about it, and they said: It is the day on which Allah saved Musa and his people, and destroyed Pharaoh and his people. So Musa fasted it in gratitude to Allah, and we fast it. The Prophet (peace and blessings be upon him) said: So the recommended practice is to fast this day, the Day of Ashura.
The recommended practice is to fast a day before it or a day after it; because it was narrated from him (peace and blessings be upon him) that he said: and in another wording: .
And in another hadith: meaning: together with the 10th. So this is the best, that the 10th is fasted; because it is a great day on which great good occurred for Musa and the Muslims. And our Prophet Muhammad (peace and blessings be upon him) fasted it, so we fast it following our Prophet (peace and blessings be upon him) and acting in accordance with what was legislated by him (peace and blessings be upon him). And we fast with it a day before it or a day after it, in order to differ from the Jews.
The best is the 9th with the 10th, due to the hadith: If one fasts the 10th and the 11th, or fasts the three days, all of it is good. If one fasts the 9th, 10th, and 11th, all of it is fine, and it includes differing from the Jews. If one fasts the whole month, it is better and better. Yes.