Sunan an-Nasa'i 2409

Arabic

أَخْبَرَنَا عَلِيُّ بْنُ الْحَسَنِ اللاَّنِيُّ، بِالْكُوفَةِ عَنْ عَبْدِ الرَّحِيمِ، - وَهُوَ ابْنُ سُلَيْمَانَ - عَنْ عَاصِمٍ الأَحْوَلِ، عَنْ أَبِي عُثْمَانَ، عَنْ أَبِي ذَرٍّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَنْ صَامَ ثَلاَثَةَ أَيَّامٍ مِنَ الشَّهْرِ فَقَدْ صَامَ الدَّهْرَ كُلَّهُ ‏"‏ ‏.‏ ثُمَّ قَالَ ‏"‏ صَدَقَ اللَّهُ فِي كِتَابِهِ ‏{‏ مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا ‏}‏ ‏"‏ ‏.‏

Translation

It was narrated that Abu Dharr said:"The Messenger of Allah said: 'Whoever fasts for three days of each month, he has fasted for a whole lifetime.' Then he said: Allah has spoken the truth in His book: Whoever brings a good deed shall have ten times the like thereof to his credit

Authenticity

Sahih · Abu Ghuddah

Reference