Musnad Ahmad 307
It was narrated that ‘AbdurRahman bin Abi Laila said:
I was with al-Bara` bin `Azib and `Umar bin al-Khattab (رضي الله عنه) in al-Baqee, looking for the new moon, when a rider came and was met by `Umar (رضي الله عنه), who said: Where have you come from? He said: From the Bedouins. He said: Have you sighted the moon? He said: Yes. ‘Umar said: Allah Akbar! Verily one man`s (testimony) is enough for the Muslims. Then ‘Umar got up and did wudoo`, and he wiped over his leather slippers, then he prayed Maghrib. Then he said. This is what I saw the Messenger of Allah (ﷺ) do. Abun-Nadr said. He was wearing a jubbah with tight sleeves, and he brought his arm out from beneath it and wiped over his leather slippers.
حَدَّثَنَا يَزِيدُ، أَنْبَأَنَا وَرْقَاءُ، وَأَبُو النَّضْرِ، قَالَ حَدَّثَنَا وَرْقَاءُ، عَنْ عَبْدِ الْأَعْلَى الثَّعْلَبِيِّ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، قَالَ كُنْتُ مَعَ الْبَرَاءِ بْنِ عَازِبٍ وَعُمَرُ بْنُ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ فِي الْبَقِيعِ يَنْظُرُ إِلَى الْهِلَالِ فَأَقْبَلَ رَاكِبٌ فَتَلَقَّاهُ عُمَرُ رَضِيَ اللَّهُ عَنْهُ فَقَالَ مِنْ أَيْنَ جِئْتَ فَقَالَ مِنْ الْعَرَبِ قَالَ أَهْلَلْتَ قَالَ نَعَمْ قَالَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ اللَّهُ أَكْبَرُ إِنَّمَا يَكْفِي الْمُسْلِمِينَ الرَّجُلُ ثُمَّ قَامَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ فَتَوَضَّأَ فَمَسَحَ عَلَى خُفَّيْهِ ثُمَّ صَلَّى الْمَغْرِبَ ثُمَّ قَالَ هَكَذَا رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَنَعَ قَالَ أَبُو النَّضْرِ وَعَلَيْهِ جُبَّةٌ ضَيِّقَةُ الْكُمَّيْنِ فَأَخْرَجَ يَدَهُ مِنْ تَحْتِهَا وَمَسَحَ‏.‏