Hadith
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، - رضى الله عنهما - عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ ذَكَرَ رَمَضَانَ فَقَالَ " لاَ تَصُومُوا حَتَّى تَرَوُا الْهِلاَلَ وَلاَ تُفْطِرُوا حَتَّى تَرَوْهُ فَإِنْ أُغْمِيَ عَلَيْكُمْ فَاقْدِرُوا لَهُ " .
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Ibn Umar (Allah be pleased with both of them) reported Allah's Messenger (ﷺ) as saying in connection with Ramadan:Do not fast till you see the new moon, and do not break fast till you see it; but if the weather is cloudy calculate about it
Sahih
Sahih Muslim 2498 ·Book 13, Hadith 4·Also available on sunnah.com·