صحيح البخاري Sahih Bukhari كتاب الصوم The Book of As-Saum (The Fasting).
بَابُ صَوْمِ الدَّهْرِ:

(56) Chapter. Observing Saum (fasting) daily throughout the life.

1 hadith
Hadith 1976
حَدَّثَنَا أَبُو الْيَمَانِ ، أَخْبَرَنَا شُعَيْبٌ ، عَنِ الزُّهْرِيِّ ، قَالَ : أَخْبَرَنِي سَعِيدُ بْنُ الْمُسَيِّبِ ، وَأَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ ، أَنَّ عَبْدَ اللَّهِ بْنَ عَمْرٍو ، قَالَ : أُخْبِرَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، أَنِّي أَقُولُ : وَاللَّهِ لَأَصُومَنَّ النَّهَارَ ، وَلَأَقُومَنَّ اللَّيْلَ مَا عِشْتُ ، فَقُلْتُ لَهُ : قَدْ قُلْتُهُ بِأَبِي أَنْتَ وَأُمِّي ، قَالَ : فَإِنَّكَ لَا تَسْتَطِيعُ ذَلِكَ ، " فَصُمْ وَأَفْطِرْ ، وَقُمْ وَنَمْ ، وَصُمْ مِنَ الشَّهْرِ ثَلَاثَةَ أَيَّامٍ ، فَإِنَّ الْحَسَنَةَ بِعَشْرِ أَمْثَالِهَا ، وَذَلِكَ مِثْلُ صِيَامِ الدَّهْرِ " ، قُلْتُ : إِنِّي أُطِيقُ أَفْضَلَ مِنْ ذَلِكَ ، قَالَ : فَصُمْ يَوْمًا وَأَفْطِرْ يَوْمَيْنِ ، قُلْتُ : إِنِّي أُطِيقُ أَفْضَلَ مِنْ ذَلِكَ ، قَالَ : فَصُمْ يَوْمًا وَأَفْطِرْ يَوْمًا ، فَذَلِكَ صِيَامُ دَاوُدَ عَلَيْهِ السَّلَام وَهُوَ أَفْضَلُ الصِّيَامِ ، فَقُلْتُ : إِنِّي أُطِيقُ أَفْضَلَ مِنْ ذَلِكَ ، فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : لَا أَفْضَلَ مِنْ ذَلِكَ .
Narrated `Abdullah bin `Amr: Allah's Apostle was informed that I had taken an oath to fast daily and to pray (every night) all the night throughout my life (so Allah's Apostle came to me and asked whether it was correct): I replied, "Let my parents be sacrificed for you! I said so." The Prophet said, "You can not do that. So, fast for few days and give it up for few days, r ray and sleep. Fast three days a month as the reward of good deeds is multiplied ten times and that will be equal to one year of fasting." I replied, "I can do better than that." The Prophet said to me, "Fast one day and give up fasting for a day and that is the fasting of Prophet David and that is the best fasting." I said, "I have the power to fast better (more) than that." The Prophet said, "There is no better fasting than that."
Hadith Reference Sahih Bukhari / The Book of As-Saum (The Fasting). / Hadith: 1976
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة