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Imam Muslim : 1799

حَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى أَخْبَرَنَا ابْنُ وَهْبٍ أَخْبَرَنِي يُونُسُ عَنْ ابْنِ شِهَابٍ قَالَ حَدَّثَنِي سَالِمُ بْنُ عَبْدِ اللَّهِ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدِرُوا لَهُ

Narrated to me by [Harmalah bin Yahya] it was informed to us by [Ibnu Wahb] it was informed to me by [Yunus] from [Ibnu Syihab] he said, Narrated to me by [Salim bin Abdullah] that [Abdullah bin Umar] (may Allah be pleased with them) said I heard the Messenger of Allah (peace be upon him) say: 'If you see the crescent moon, then fast and if you see it (rise) again, then break the fast, but if it is covered from your sight, then count (its days).'