Fasting on the day of 'Ashura’ is optional

السلام عليكم ورحمة الله وبركاتة

بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِٱلرَّحِيمِ

Narrated Aisha (RA): Quraish used to fast on the day of 'Ashura' in the Pre-Islamic period, and Allah's Messenger (SAW) too, used to fast on that day. When he came to Madhina, he fasted on that day and ordered others to fast, too. Later when the fasting of the month of Ramadan was prescribed, he gave up fasting on the day of 'Ashura' and it became optional for one to fast on it or not. [Sahih al-Bukhari 2002]

الحمدلله