Sunan An Nasai 2436

أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ مُحَمَّدِ بْنِ سَلَّامٍ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ أَنْبَأَنَا الْأَسْوَدُ بْنُ شَيْبَانَ، ‏‏‏‏‏‏عَنْ أَبِي نَوْفَلِ بْنِ أَبِي عَقْرَبٍ،‏‏‏‏ عَنْ أَبِيهِ، ‏‏‏‏‏‏أَنَّهُ سَأَلَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ 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 صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:‏‏‏‏ إِنِّي أَجِدُنِي قَوِيًّا، ‏‏‏‏‏‏إِنِّي أَجِدُنِي قَوِيًّا ، ‏‏‏‏‏‏فَمَا كَادَ أَنْ يَزِيدَهُ فَلَمَّا أَلَحَّ عَلَيْهِ،‏‏‏‏ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:‏‏‏‏ صُمْ ثَلَاثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ .

It was narrated from Abu Nawfal bin Abi 'Aqrab, from his father, that he asked the Prophet about fasting and he said: 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.