Hadith on Ashura: Recommendation to fast the day of Ashura

Ibn Umar reported: The Prophet, peace and blessings be upon him, said, “Verily, Ashura is a day among the days of Allah. Whoever wishes to fast may do so, and whoever wishes to break his fast may do so.”

Source: Ṣaḥīḥ Muslim 1126

Grade: Sahih (authentic) according to Muslim

عَنْ ابْنِ عُمَرَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّ عَاشُورَاءَ يَوْمٌ مِنْ أَيَّامِ اللَّهِ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ

1126 صحيح مسلم كتاب الصيام باب صوم يوم عاشوراء