حَدَّثَنَا عَفَّانُ حَدَّثَنَا هَمَّامٌ حَدَّثَنَا قَتَادَةُ عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ الْعُقَيْلِيِّ عَنِ ابْنِ عُمَرَ أَنَّ رَجُلًا مِنْ أَهْلِ الْبَادِيَةِ سَأَلَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ صَلَاةِ اللَّيْلِ فَقَالَ بِإِصْبَعَيْهِ مَثْنَى مَثْنَى وَالْوَتْرُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ
مسند امام احمد بن حنبل · Hadith 5759
It was narrated from Ibn Umar that a man from the desert asked the Messenger of Allah (PBUH) about prayer at night, and he said, gesturing with his two fingers, "Two (rak'ahs) by two, and Witr is one rak'ah at the end of the night."
Sanad
حَدَّثَنَا عَفَّانُ حَدَّثَنَا هَمَّامٌ حَدَّثَنَا قَتَادَةُ عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ الْعُقَيْلِيِّ عَنِ ابْنِ عُمَرَ