Sahih Muslim Book: 14, Hadith: 2551

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو أُسَامَةَ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، رضى الله عنهما أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم ذَكَرَ رَمَضَانَ فَضَرَبَ بِيَدَيْهِ فَقَالَ ‏ “‏ الشَّهْرُ هَكَذَا وَهَكَذَا وَهَكَذَا – ثُمَّ عَقَدَ إِبْهَامَهُ فِي الثَّالِثَةِ – فَصُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ أُغْمِيَ عَلَيْكُمْ فَاقْدِرُوا لَهُ ثَلاَثِينَ ‏”‏ ‏.‏ Ibn Umar reported that Allah’s Messenger (may peace be upon him) made a mention of Ramadan and he with the gesture of his hand said:The month is thus and thus. (He then withdrew his thumb at the third time). He then said: Fast when you see it, and break your fast when you see it, and if the weather is cloudy calculate it (the months of Sha’ban and Shawwal) as thirty days. Chain : Abu Bakr bin Abi Shayba – Hammad bin Usamah – ‘Ubaidullah bin ‘Umar bin Hafs – Nafie’ – ibn Umar Data S...