رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1250
The Book of Virtues
The Excellence of Observing Saum on the Day of 'Arafah, 'Ashura' and Tasu'a (i.e., 9th of Muharram)
وَعَنْ أَبِي قَتَادَةَ رَضِيَ اللَّه عَنْهُ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ: عَنْ صَوْمِ يَوْمِ عَرَفَةَ؟ قَالَ: يُكَفِّرُ اَلسَّنَةَ اَلْمَاضِيَةَ وَالْبَاقِيَةَ ((رَوَاهُ مُسْلِم)).
Abu Qatadah (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) was asked about the observance of Saum (fasting) on the day of 'Arafah. He said, "It is an expiation for the sins of the preceding year and the current year." [Muslim].
Riyad as-Salihin, 1250