حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ حَدَّثَنَا مَالِکٌ عَنْ نَافِعٍ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا أَنَّ رَسُولَ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ ذَکَرَ رَمَضَانَ فَقَالَ لَا تَصُومُوا حَتَّی تَرَوْا الْهِلَالَ وَلَا تُفْطِرُوا حَتَّی تَرَوْهُ فَإِنْ غُمَّ عَلَيْکُمْ فَاقْدُرُوا لَهُ
صحیح بخاری · Hadith 1906
Narrated `Abdullah bin `Umar: Allah's Apostle mentioned Ramadan and said, "Do not fast unless you see the crescent (of Ramadan), and do not give up fasting till you see the crescent (of Shawwal), but if the sky is overcast (if you cannot see it), then act on estimation (i.e. count Sha'ban as 30 days).
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020