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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:2754 – ʿAbd al-Raḥman b. Muḥammad b. Sallām > Yazīd b. Hārūn > al-Aswad b. Shaybān > Abū Nawfal b. Abū ʿAqrab from his father

"Fast one day of each month." He asked him for more, saying: "May my father and mother be ransomed for you, I am able." He said: "Fast two days of each month." He said" May my father and mother be sacrificed for you, O Messenger of Allah, I am able." The Messenger of Allah said: "I am able, I am able." He did not want to increase it, but when I insisted, the Messenger of Allah said: "Fast three days of each month." (Sahih) The end of what the Shaikh had about fasting, all praise is due to Allah the Lord of the worlds. (Using translation from Nasāʾī 2434)   

الكبرى للنسائي:٢٧٥٤ – أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ مُحَمَّدِ بْنِ سَلَّامٍ قَالَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ قَالَ أَخْبَرَنَا الْأَسْوَدُ بْنُ شَيْبَانَ عَنْ أَبِي نَوْفَلِ بْنِ أَبِي عَقْرَبٍ عَنْ أَبِيهِ

أَنَّهُ سَأَلَ النَّبِيَّ ﷺ عَنِ الصَّوْمِ فَقَالَ «صُمْ يَوْمًا مِنْ كُلِّ شَهْرٍ» فَاسْتَزَادَهُ وَقَالَ بِأَبِي أَنْتَ وَأُمِّي أَجِدُنِي قَوِيًّا فَزِدْنِي فَقَالَ رَسُولُ اللهِ ﷺ «إِنِّي أَجِدُنِي قَوِيًّا إِنِّي أَجِدُنِي قَوِيًّا» فَمَا كَادَ أَنْ يَزِيدَهُ فَاسْتَزَادَهُ فَزَادَهُ فَقَالَ «صُمْ يَوْمَيْنِ مِنْ كُلِّ شَهْرٍ» فَقَالَ بِأَبِي أَنْتَ وَأُمِّي يَا رَسُولَ اللهِ إِنِّي أَجِدُنِي قَوِيًّا فَقَالَ رَسُولُ اللهِ ﷺ «إِنِّي أَجِدُنِي قَوِيًّا إِنِّي أَجِدُنِي قَوِيًّا» فَمَا كَادَ أَنْ يَزِيدَهُ فَلَمَّا أَلَحَّ عَلَيْهِ قَالَ رَسُولُ ﷺ «صُمْ ثَلَاثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ»  

See similar narrations below:

Collected by Nasāʾī, Aḥmad
nasai:2434 – ʿAbd al-Raḥman b. Muḥammad b. Salāam > Yazīd b. Hārūn > al-Aswad b. Shaybān > Abū Nawfal b. Abū ʿAqrab from his father

"Fast one day of each month." He asked him for more, saying: "May my father and mother be ransomed for you, I am able." He said: "Fast two days of each month." He said" May my father and mother be sacrificed for you, O Messenger of Allah, I am able." The Messenger of Allah said: "I am able, I am able." He did not want to increase it, but when I insisted, the Messenger of Allah said: "Fast three days of each month." (Sahih) The end of what the Shaikh had about fasting, all praise is due to Allah the Lord of the worlds.  

النسائي:٢٤٣٤ – أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ مُحَمَّدِ بْنِ سَلاَّمٍ قَالَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ قَالَ أَنْبَأَنَا الأَسْوَدُ بْنُ شَيْبَانَ عَنْ أَبِي نَوْفَلِ بْنِ أَبِي عَقْرَبٍ عَنْ أَبِيهِ

أَنَّهُ سَأَلَ النَّبِيَّ ﷺ عَنِ الصَّوْمِ فَقَالَ صُمْ يَوْمًا مِنْ كُلِّ شَهْرٍ وَاسْتَزَادَهُ قَالَ بِأَبِي أَنْتَ وَأُمِّي أَجِدُنِي قَوِيًّا فَزَادَهُ قَالَ صُمْ يَوْمَيْنِ مِنْ كُلِّ شَهْرٍ فَقَالَ بِأَبِي أَنْتَ وَأُمِّي يَا رَسُولَ اللَّهِ إِنِّي أَجِدُنِي قَوِيًّا فَقَالَ رَسُولُ اللَّهِ ﷺ إِنِّي أَجِدُنِي قَوِيًّا إِنِّي أَجِدُنِي قَوِيًّا فَمَا كَادَ أَنْ يَزِيدَهُ فَلَمَّا أَلَحَّ عَلَيْهِ قَالَ رَسُولُ اللَّهِ ﷺ صُمْ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ  

ahmad:20662 – Yazīd b. Hārūn > al-Aswad b. Shaybān > Abū Nawfal b. Abū ʿAqrab from his father

"Fast one day of each month." He asked him for more, saying: "May my father and mother be ransomed for you, I am able." He said: "Fast two days of each month." He said" May my father and mother be sacrificed for you, O Messenger of Allah, I am able." The Messenger of Allah said: "I am able, I am able." He did not want to increase it, but when I insisted, the Messenger of Allah said: "Fast three days of each month." (Sahih) The end of what the Shaikh had about fasting, all praise is due to Allah the Lord of the worlds. (Using translation from Nasāʾī 2434)   

أحمد:٢٠٦٦٢ – حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ أَخْبَرَنَا الْأَسْوَدُ بْنُ شَيْبَانَ عَنْ أَبِي نَوْفَلِ بْنِ أَبِي عَقْرَبٍ عَنْ أَبِيهِ

أَنَّهُ سَأَلَ النَّبِيَّ ﷺ عَنِ الصَّوْمِ فَقَالَ صُمْ يَوْمًا مِنْ كُلِّ شَهْرٍ فَاسْتَزَادَهُ فَقَالَ بِأَبِي وَأُمِّي إِنِّي أَجِدُنِي أَقْوَى فَزِدْنِي فَقَالَ رَسُولُ اللهِ ﷺ إِنِّي أَجِدُنِي قَوِيًّا إِنِّي أَجِدُنِي قَوِيًّا فَمَا كَادَ أَنْ يَزِيدَهُ فَاسْتَزَادَهُ فَقَالَ صُمْ يَوْمَيْنِ مِنْ كُلِّ شَهْرٍ قَالَ بِأَبِي أَنْتَ وَأُمِّي يَا رَسُولَ اللهِ إِنِّي أَجِدُنِي قَوِيًّا فَقَالَ رَسُولُ اللهِ ﷺ إِنِّي أَجِدُنِي قَوِيًّا إِنِّي أَجِدُنِي قَوِيًّا ‍ فَمَا كَادَ أَنْ يَزِيدَهُ فَلَمَّا أَلْحَمَ عَلَيْهِ قَالَ رَسُولُ اللهِ ﷺ صُمْ ثَلَاثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ