Today: 3rd of Muharram, Wednesday August 11
Muharram 9: Tuesday August 17
Muharram 10 (Yawm 'Ashura): Wednesday August 18
Muharram 11: Thursday August 19
📖 Abu Qatadah RadhiAllahu 'anhu narrated: The Messenger Muhammad SallAllahu 'alaihi wa sallam was asked about fasting the day of Arafat (Yawm 'Arafah) and he SallAllahu 'alaihi wa sallam said, "It will expiate the sins of the previous and upcoming year." Then, the Prophet SallAllahu 'alaihi wa sallam was asked about fasting the day of Ashura (10th of Muharram) and he SallAllahu 'alaihi wa sallam said, "It will expiate the sins of the past year."
Source: Sahih Muslim 1162
Grade: Sahih (Authentic) according to Muslim
📖 Ibn Abbas RadhiAllahu 'anhu narrated: The Messenger of Allah SallAllahu 'alaihi wa sallam came to Medina and he found the Jews fasting on the day of Ashura. The Prophet Muhammad SallAllahu 'alaihi wa sallam said, "What is this day that you are fasting?" They said, “This is a great day in which Allah saved Moses ('alaihis salaam) and his people, and he drowned Pharaoh and his people. Moses fasted on it due to gratitude, so we also fast on it.” The Prophet SallAllahu 'alaihi wa sallam said, "We (Muslims) are more deserving and are closer to Moses (Musa 'alaihis salaam) than you." The Prophet Muhammad SallAllahu 'alaihi wa sallam fasted the day of Ashura (10th of Muharram) and he commanded fasting on it.
Source: Sahih Al-Bukhari 3216
Sahih Muslim 1130
Grade: Muttafaqun Alayhi (Authenticity agreed upon) according to Al-Bukhari and Muslim
https://hijri-calendar.com/Muharam/1443