Bismillaah.
A reminder for myself and others about fasting the 9th and 10th of Muharram, as well as the overall blessings in fasting and performing other good deeds in this month.
‘Abd-Allaah ibn ‘Abbaas (may Allaah be pleased with him) said: “When the Messenger of Allaah (peace and blessings of Allaah be upon him) fasted on the day of ‘Ashoora and told the people to fast, they said, “O Messenger of Allaah, this is a day that is venerated by the Jews and Christians.” The Messenger of Allaah (peace and blessings of Allaah be upon him) said, “Next year, if Allaah wills, we will fast on the ninth day.” But by the time the following year came, the Messenger of Allaah (peace and blessings of Allaah be upon him) had passed away.” Narrated by Muslim, 1916.
Al-Shaafa’i and his companions, Ahmad, Ishaaq and others said: It is mustahabb [recommended] to fast both the ninth and the tenth, because the Prophet (peace and blessings of Allaah be upon him) fasted the tenth and intended to fast the ninth.
Based on this, there are different ways of fasting ‘Ashoora’, the least of which is to fast the tenth only, but it is better to fast the ninth as well. The more one fasts in Muharram, the better. [Source]
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It was proven from the Prophet (peace and blessings of Allaah be upon him) that the best fasting after Ramadaan is fasting in the month of Muharram. It was narrated that Abu Hurayrah (may Allaah be pleased with him) said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “The best fasting after Ramadaan is the month of Allaah Muharram, and the best prayer after the obligatory prayer is prayer at night.” Narrated by Muslim, 1163.
With regard to the phrase “the month of Allaah”, mentioning the month in conjunction with Allaah is a sign of its great status. Al-Qaari said: it seems that what is meant is all of the month of Muharram.
But it was proven that the Prophet (peace and blessings of Allaah be upon him) did not fast any month in full apart from Ramadaan, so this hadeeth is to be understood as meaning that it is it is encouraged to fast a lot in the month of Muharram, not to fast the whole month.
And Allaah knows best. [Source]