Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
nasai:2409ʿAlī b. al-Ḥasan al-Lāanī Bi-al-Kūfah > ʿAbd al-Raḥīm / Ibn Sulaymān > ʿĀṣim al-Aḥwal > Abū ʿUthmān > Abū Dhar

"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.  

النسائي:٢٤٠٩أَخْبَرَنَا عَلِيُّ بْنُ الْحَسَنِ اللاَّنِيُّ بِالْكُوفَةِ عَنْ عَبْدِ الرَّحِيمِ وَهُوَ ابْنُ سُلَيْمَانَ عَنْ عَاصِمٍ الأَحْوَلِ عَنْ أَبِي عُثْمَانَ عَنْ أَبِي ذَرٍّ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ صَامَ ثَلاَثَةَ أَيَّامٍ مِنَ الشَّهْرِ فَقَدْ صَامَ الدَّهْرَ كُلَّهُ ثُمَّ قَالَ صَدَقَ اللَّهُ فِي كِتَابِهِ { مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا }  


See similar narrations below:

Collected by Tirmidhī, Ibn Mājah
tirmidhi:762Hannād > Abū Muʿāwiyah > ʿĀṣim al-Aḥwal > Abū ʿUthmān al-Nahdī > Abū Dhar

"The Messenger of Allah said: 'Whoever fasts three days in every month, then that is (similar to) fasting every day.' Then Allah Mighty and Sublime is He, attested to that in His Book, by revealing: Whoever brings a good deed, shall have ten times the like thereof. So a day is like ten."  

الترمذي:٧٦٢حَدَّثَنَا هَنَّادٌ حَدَّثَنَا أَبُو مُعَاوِيَةَ عَنْ عَاصِمٍ الأَحْوَلِ عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ عَنْ أَبِي ذَرٍّ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ صَامَ مِنْ كُلِّ شَهْرٍ ثَلاَثَةَ أَيَّامٍ فَذَلِكَ صِيَامُ الدَّهْرِ فَأَنْزَلَ اللَّهُ ﷻ تَصْدِيقَ ذَلِكَ فِي كِتَابِهِ (مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا ) الْيَوْمُ بِعَشَرَةِ أَيَّامٍ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ وَقَدْ رَوَى شُعْبَةُ هَذَا الْحَدِيثَ عَنْ أَبِي شِمْرٍ وَأَبِي التَّيَّاحِ عَنْ أَبِي عُثْمَانَ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ
ibnmajah:1708Sahl b. Abū Sahl > Abū Muʿāwiyah > ʿĀṣim al-Aḥwal > Abū ʿUthmān > Abū Dhar

“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).  

ابن ماجة:١٧٠٨حَدَّثَنَا سَهْلُ بْنُ أَبِي سَهْلٍ حَدَّثَنَا أَبُو مُعَاوِيَةَ عَنْ عَاصِمٍ الأَحْوَلِ عَنْ أَبِي عُثْمَانَ عَنْ أَبِي ذَرٍّ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ صَامَ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ فَذَلِكَ صَوْمُ الدَّهْرِ فَأَنْزَلَ اللَّهُ ﷻ تَصْدِيقَ ذَلِكَ فِي كِتَابِهِ {مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا} فَالْيَوْمُ بِعَشْرَةِ أَيَّامٍ