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 2739 in Maktaba Shamila
وحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَزُهَيْرُ بْنُ حَرْبٍ ، قَالَ زُهَيْرٌ ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ ، عَنْ عَمْرِو بْنِ دِينَارٍ ، عَنْ عَمْرِو بْنِ أَوْسٍ ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا ، قَالَ : قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " إِنَّ أَحَبَّ الصِّيَامِ إِلَى اللَّهِ صِيَامُ دَاوُدَ ، وَأَحَبَّ الصَّلَاةِ إِلَى اللَّهِ صَلَاةُ دَاوُدَ عَلَيْهِ السَّلَامُ ، كَانَ يَنَامُ نِصْفَ اللَّيْلِ ، وَيَقُومُ ثُلُثَهُ ، وَيَنَامُ سُدُسَهُ ، وَكَانَ يَصُومُ يَوْمًا ، وَيُفْطِرُ يَوْمًا " .
'Abdullah bin 'Amr (Allah be pleased with both of them) reported Allah's Messenger (ﷺ) as saying: With Allah the best fasting is that of David and the best prayer is that of David (peace be upon him) for he slept half of the night and stood for prayer for the third of it and (then) slept the sixth part of it and he observed fast one day and broke on the other.
