The supererogatory fasting of Āshura is observed on the

The supererogatory fasting of Āshura is observed on the 10th of al-Muharram in the Islamic calendar. It is a recommended act of worship and is not obligatory, but Muslims who observe this fast believe it carries great reward and blessings. The fasting of Āshura has a significant historical significance in Islam, as it marks the day when Allah saved Prophet Musa (Moses) and the Children of Israel from the Pharaoh in Egypt. It is also believed to be the day on which Allah forgave the sins of Adam (the first man) and his wife Eve. Muslims observe this fast by abstaining from food, drink, and other physical needs from dawn until sunset, just like the obligatory fast of Ramadan. It is recommended to also fast on either the 9th or the 11th of Muharram to distinguish this supererogatory fast from the Jewish practice of fasting on the 10th of Muharram, which is known as Yom Kippur.