In the name of Allah, Most Gracious, Most Merciful
Ibn Abbas (MAPH) reported: The Messenger of Allah (SAWS) observed Saum (fasting) on the day of ‘Ashura and Muslim)
Abu Qatadah (MAPH) reported: The Messenger of Allah (SAWS) was asked about observing As-Saum (the fast) on the tenth day of Muharram, and he replied: “It is an expiation for the sins of the preceding year.” (Muslim)
Ibn Abbas (MAPH) reported: The Messenger of Allah (SAWS) said: “If I remain alive till the next year, I shall also observe fast on the ninth of Muharram.” (Muslim)
1. These days of fasting are voluntary however encouraged and desirable (mustahabb).
2. This year the 9th day of Muharram is Monday, October 10th, insha Allah.
3. This year the 10th day of Muharram is Tuesday, October 11th insha Allah.
Some History: It is stated that when the Prophet (SAWS) emigrated from Makkah to Al-Madinah, he saw that the Jews were fasting on this day. He asked them why they did this on that day, and 11th of Muharram.