Full Sharh — Sahih Muslim 2724
حَدَّثَنَا أَبُو الرَّبِيعِ الزَّهْرَانِيُّ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ أَبِي بِشْرٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، - رضى الله عنهما - قَالَ مَا صَامَ رَسُولُ اللَّهِ صلى الله عليه وسلم شَهْرًا كَامِلاً قَطُّ غَيْرَ رَمَضَانَ . وَكَانَ يَصُومُ إِذَا صَامَ حَتَّى يَقُولَ الْقَائِلُ لاَ وَاللَّهِ لاَ يُفْطِرُ . وَيُفْطِرُ إِذَا أَفْطَرَ حَتَّى يَقُولَ الْقَائِلُ لاَ وَاللَّهِ لاَ يَصُومُ .
English Translation
Ibn Abbas (Allah be pleased with both of them) reported:The Messenger of Allah (ﷺ) did not fast throughout any month except during ramadan. And when he observed fast (he fasted so continuously) that one would say that he would not break (them) and when he Abandoned, he abandoned (so continuously) that one would say: By Allah, perhaps he would never fast
Source
Sahih Muslim(صحيح مسلم)
The Book of Fasting
Hadith Number
2724