\nNarrated `Abdullah bin `Umar:\n \n\nAllah's Messenger (ﷺ) mentioned Ramadan and said, "Do not fast unless you see the crescent (of Ramadan), \nand do not give up fasting till you see the crescent (of Shawwal), but if the sky is overcast (if you \ncannot see it), then act on estimation (i.e. count Sha'ban as 30 days).\n

\nNarrated `Abdullah bin `Umar:\n \n\nAllah's Messenger (ﷺ) mentioned Ramadan and said, "Do not fast unless you see the crescent (of Ramadan), \nand do not give up fasting till you see the crescent (of Shawwal), but if the sky is overcast (if you \ncannot see it), then act on estimation (i.e. count Sha'ban as 30 days).\n

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم ذَكَرَ رَمَضَانَ فَقَالَ ‏\n"‏ لاَ تَصُومُوا حَتَّى تَرَوُا الْهِلاَلَ، وَلاَ تُفْطِرُوا حَتَّى تَرَوْهُ، فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ ‏"‏‏.‏