صحيح مسلم
Sahih Muslim
كتاب الصيام
The Book of Fasting
باب النَّهْيِ عَنْ صَوْمِ الدَّهْرِ لِمَنْ تَضَرَّرَ بِهِ أَوْ فَوَّتَ بِهِ حَقًّا أَوْ لَمْ يُفْطِرِ الْعِيدَيْنِ وَالتَّشْرِيقَ وَبَيَانِ تَفْضِيلِ صَوْمِ يَوْمٍ وَإِفْطَارِ يَوْمٍ:
Chapter: Prohibition of Fasting for a lifetime for the one who will be harmed by that or who will neglect other duties, or does not break his fast on the two 'Ids or during the days of At-Tashriq; It is better to fast alternate days
Hadith 1159
This hadith is listed as number 2731 in Maktaba Shamila
وَحَدَّثَنِيهِ زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا رَوْحُ بْنُ عُبَادَةَ ، حَدَّثَنَا حُسَيْنٌ الْمُعَلِّمُ ، عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ : بِهَذَا الْإِسْنَادِ ، وَزَادَ فِيهِ بَعْدَ قَوْلِهِ " مِنْ كُلِّ شَهْرٍ ثَلَاثَةَ أَيَّامٍ فَإِنَّ لَكَ بِكُلِّ حَسَنَةٍ عَشْرَ أَمْثَالِهَا فَذَلِكَ الدَّهْرُ كُلُّهُ " ، وَقَالَ فِي الْحَدِيثِ ، قُلْتُ : وَمَا صَوْمُ نَبِيِّ اللَّهِ دَاوُدَ ؟ ، قَالَ : " نِصْفُ الدَّهْرِ " ، وَلَمْ يَذْكُرْ فِي الْحَدِيثِ مِنْ قِرَاءَةِ الْقُرْآنِ شَيْئًا وَلَمْ يَقُلْ : " وَإِنَّ لِزَوْرِكَ عَلَيْكَ حَقًّا " ، وَلَكِنْ قَالَ : " وَإِنَّ لِوَلَدِكَ عَلَيْكَ حَقًّا " .
This hadith has been narrated by Yahya bin Abu Kathir with the same chain of transmitters and he made this addition after these words: During every month, (fasting) for three days, there is for you ten times for every good and that is perpetual fasting (for three days would bring a reward for full thirty days). I said: What is the fast of the Apostle of Allah (ﷺ) , David? He said: Half of the age (observing fast on alternate days for the whole
