Hadith
حَدَّثَنَا سَهْلُ بْنُ أَبِي سَهْلٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ عَاصِمٍ الأَحْوَلِ، عَنْ أَبِي عُثْمَانَ، عَنْ أَبِي ذَرٍّ، قَالَ: قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَنْ صَامَ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ فَذَلِكَ صَوْمُ الدَّهْرِ " . فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ تَصْدِيقَ ذَلِكَ فِي كِتَابِهِ {مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا} فَالْيَوْمُ بِعَشْرَةِ أَيَّامٍ .
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It was narrated from Abu Dharr that the Messenger of Allah (ﷺ) said:“Whoever fasts three days in every month, that is fasting for a lifetime.” Then, in testimony of that, Allah revealed: “Whoever brings a good deed shall have ten time the like thereof to his credit.” [6:160] So one day is equivalent to ten (in reward)
Sahih · Al-Albani
Sunan Ibn Majah 1708 ·Book 7, Hadith 71·Also available on sunnah.com·