The Day of ‘Aashooraa’ is one of the blessed days of Allah, Exalted is He, on which He saved His Prophet Moosaa from Pharaoh and his army. The Messenger of Allahﷺ fasted it, and commanded Muslims to fast as well. It was the first prescribed fast for Muslims before fasting was deemed obligatory in Ramadan. In this hadeeth, Salamah ibn Al-Akwa‘ (may Allah be pleased with him) stated that the Prophet ﷺ sent a man, i.e., Hind ibn Asmaa’ ibn Haarithah Al-Aslamee(may Allah be pleased with him), as stated in Musnad Ahmad and other Hadeeth collections, to announce to people on the Day of ‘Aashooraa’, the 10th day of the sacred month of Muharram, that whoever had eaten on that day should abstain from eating for the rest of the day until the time of Iftaar, to honor the sacredness of this blessed day, and that whoever had not eaten yet should hold the intention of fasting and fast. After the fasting of Ramadan was deemed obligatory, fasting on the Day of ‘Aashooraa’became optional.It has been reported that fasting on the Day of ‘Aashooraa’ expiates the sins committed during the previous year, as reported on the authority of Aboo Qataadah (may Allah be pleased with him) and narrated by Imam Muslim. Many narrations have been reported regarding the reasons why the Prophet ﷺ fasted onthe Day of ‘Aashooraa’. For instance, it was narrated on the authority of Ibn ‘Abbaas (may Allah be pleased with him) that he said:“When the Prophet ﷺ came to Al-Madeenah, he found (the Jews) fasting on the Day of ‘Aashooraa’ (i.e., 10th of Muharram). They used to say: "This is a great day on which Allah, Exalted is He, saved Prophet Moosaa and drowned the folk of Pharaoh. Moosaa observed the fast on this day, as a sign of gratitude to Allah." The Prophet ﷺ said, "I am closer to [Prophet] Moses than they!" So, he observed fast (on that day) and ordered the Muslims to fast on it.” [Al-Bukhaaree and Muslim]. Moreover, it was reported on the authority of Ibn ‘Umar (may Allah be pleased with him)that the Prophet ﷺ said about the Day of ‘Aashooraa’: “That was a day on which the people of pre-Islamic days used to observe fast. So, he who amongst you likes to observe fast should do so, and he who does not like it should abandon it.” [Al-Bukhaaree and Muslim]. .