صحيح مسلم
Sahih Muslim
كتاب الصيام
The Book of Fasting
باب اسْتِحْبَابِ صِياَمِ ثَلاَثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَصَوْمِ يَوْمِ عَرَفَةَ وَعَاشُورَاءَ وَالاِثْنَيْنِ وَالْخَمِيسِ.
Chapter: It is recommended to fast three days of every month, and to fast on the days of 'Arafah and 'Ashura', and to fast on Mondays and Thursdays
Hadith 1161
This hadith is listed as number 2745 in Maktaba Shamila
وحَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ أَسْمَاءَ الضُّبَعِيُّ ، حَدَّثَنَا مَهْدِيٌّ وَهُوَ ابْنُ مَيْمُونٍ ، حَدَّثَنَا غَيْلَانُ بْنُ جَرِيرٍ ، عَنْ مُطَرِّفٍ ، عَنْ عِمْرَانَ بْنِ حُصَيْنٍ رَضِيَ اللَّهُ عَنْهُمَا ، أَنّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، قَالَ لَهُ أَوَ قَالَ لِرَجُلٍ وَهُوَ يَسْمَعُ : " يَا فُلَانُ أَصُمْتَ مِنْ سُرَّةِ هَذَا الشَّهْرِ ؟ " ، قَالَ : لَا ، قَالَ : " فَإِذَا أَفْطَرْتَ فَصُمْ يَوْمَيْنِ " .
'Imran bin Husain (RA) reported that the Apostle of Allah (ﷺ) said to him (or he said to another person and he was listening to it): O, so and so, did you observe fast in the middle of the month? He said: No. Thereupon he (the Messenger of Allah) (ﷺ) said: When you break it, then observe fast for two days.
