عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى قَالَ: كُنْتُ مَعَ عُمَرَ رَضِيَ اللَّهُ عَنْهُ فَأَتَاهُ رَجُلٌ فَقَالَ: إِنِّي رَأَيْتُ الْهِلَالَ هِلَالَ شَوَّالٍ، فَقَالَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ: يَا أَيُّهَا النَّاسُ أَفْطِرُوا
Abdur Rahman bin Abi Laila says: I was with Sayyiduna Umar (may Allah be pleased with him) when a man came to him and said that he had seen the crescent of Shawwal yesterday. So Sayyiduna Umar (may Allah be pleased with him) said: O people! Break your fast.