Musnad Ahmad 193
It was narrated that ‘Abdur-Rahman bin Abi Laila said:
I was with ‘Umar and a man came to him and said:I have seen the new moon, the new moon of Shawwal. 'Umar said: O people, break the fast. Then he went to a vessel in which there was water and did wudoo’, and he wiped over his khuffain. A man said: By Allah, O. Ameer al-Mu'mineen, I only came to you to ask about this. Did you see any one else do this? He said: Yes, one who was better than me and the best of the ummah. I saw Abul­-Qasim ﷺ do the same as I have done, when he was wearing a Syrian jubbah with tight sleeves, he put his hand under the jubbah. Then 'Umar prayed Maghrib.
حَدَّثَنَا يَزِيدُ، أَنْبَأَنَا إِسْرَائِيلُ بْنُ يُونُسَ، عَنْ عَبْدِ الْأَعْلَى الثَّعْلَبِيِّ، 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 ثُمَّ قَامَ إِلَى عُسٍّ فِيهِ مَاءٌ فَتَوَضَّأَ وَمَسَحَ عَلَى خُفَّيْهِ فَقَالَ الرَّجُلُ وَاللَّهِ يَا أَمِيرَ الْمُؤْمِنِينَ مَا أَتَيْتُكَ إِلَّا لِأَسْأَلَكَ عَنْ هَذَا أَفَرَأَيْتَ غَيْرَكَ فَعَلَهُ فَقَالَ نَعَمْ خَيْرًا مِنِّي وَخَيْرَ الْأُمَّةِ رَأَيْتُ أَبَا الْقَاسِمِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَعَلَ مِثْلَ الَّذِي فَعَلْتُ وَعَلَيْهِ جُبَّةٌ شَامِيَّةٌ ضَيِّقَةُ الْكُمَّيْنِ فَأَدْخَلَ يَدَهُ مِنْ تَحْتِ الْجُبَّةِ ثُمَّ صَلَّى عُمَرُ الْمَغْرِبَ‏.‏