صحيح مسلم
Sahih Muslim
كتاب الصيام
The Book of Fasting
باب وُجُوبِ صَوْمِ رَمَضَانَ لِرُؤْيَةِ الْهِلاَلِ وَالْفِطْرِ لِرُؤْيَةِ الْهِلاَلِ وَأَنَّهُ إِذَا غُمَّ فِي أَوَّلِهِ أَوْ آخِرِهِ أُكْمِلَتْ عِدَّةُ الشَّهْرِ ثَلاَثِينَ يَوْمًا:
Chapter: The obligation to fast Ramadan when the crescent is sighted, and to break the fast when the crescent is sighted, and that if it is cloudy at the beginning or end of the month, then the month should be completed as thirty days.
Hadith 1080
This hadith is listed as number 2513 in Maktaba Shamila
حَدَّثَنَا أَبُو كَامِلٍ الْجَحْدَرِيُّ ، حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ ، حَدَّثَنَا الْحَسَنُ بْنُ عُبَيْدِ اللَّهِ ، عَنْ سَعْدِ بْنِ عُبَيْدَةَ ، قَالَ : سَمِعَ ابْنُ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا ، رَجُلًا يَقُولُ : اللَّيْلَةَ لَيْلَةُ النِّصْفِ ، فَقَالَ لَهُ : مَا يُدْرِيكَ أَنَّ اللَّيْلَةَ النِّصْفُ ؟ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، يَقُولُ : " الشَّهْرُ هَكَذَا وَهَكَذَا وَأَشَارَ بِأَصَابِعِهِ الْعَشْرِ مَرَّتَيْنِ ، وَهَكَذَا فِي الثَّالِثَةِ وَأَشَارَ بِأَصَابِعِهِ كُلِّهَا ، وَحَبَسَ أَوْ خَنَسَ إِبْهَامَهُ " .
Sa'd bin 'Ubaida reported that Ibn'Umar (Allah be pleased with both of them) heard a person saying: This night is the midnight (of the month). Upon this he said to him: How do you know that it is the midnight (of the month), for I heard the Mes- senger of Allah (ﷺ) as saying: The month is thus and thus (and he pointed with his ten fingers twice) and thus (i. e. at the third time he pointed with all his fingers but withdrew or folded his thumb)?
