Riyad as-SalihinChapter 8Hadith 573
Full Sharh — Riyad as-Salihin 573
وعن أبي قتادة رضي الله عنه أن رسول الله صلى الله عليه وسلم سئل عن صيام يوم عاشوراء فقال: "يكفر السنة الماضية" ((رواه مسلم)).
English Translation
Abu Qatadah (May Allah be pleased with him) reported:: The Messenger of Allah (ﷺ) was asked about observing As-Saum (the fast) on the tenth day of Muharram, and he replied, "It is an expiation for the sins of the preceding year.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Virtues
Hadith Number
573