Sahih Muslim 1751
صحيح مسلم#1751Sahihوَحَدَّثَنِي أَبُو الرَّبِيعِ الزَّهْرَانِيُّ، حَدَّثَنَا حَمَّادٌ، حَدَّثَنَا أَيُّوبُ، وَبُدَيْلٌ، عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَجُلاً، سَأَلَ النَّبِيَّ صلى الله عليه وسلم وَأَنَا بَيْنَهُ وَبَيْنَ السَّائِلِ فَقَالَ يَا رَسُولَ اللَّهِ كَيْفَ صَلاَةُ اللَّيْلِ قَالَ " مَثْنَى مَثْنَى فَإِذَا خَشِيتَ الصُّبْحَ فَصَلِّ رَكْعَةً وَاجْعَلْ آخِرَ صَلاَتِكَ وِتْرًا " . ثُمَّ سَأَلَهُ رَجُلٌ عَلَى رَأْسِ الْحَوْلِ وَأَنَا بِذَلِكَ الْمَكَانِ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم فَلاَ أَدْرِي هُوَ ذَلِكَ الرَّجُلُ أَوْ رَجُلٌ آخَرُ فَقَالَ لَهُ مِثْلَ ذَلِكَ .
Abdullah b. 'Umar reported:A person asked the Messenger of Allah (ﷺ) as I stood between him (the Holy Prophet) and the inquirer and he said: Messenger of Allah, how is the night prayer? He (the Holy Prophet) said: It consists of pairs of rak'ahs, but if you apprehend morning, you should pray one rak'ah and make the end of your prayer as Witr. Then a person asked him (the Holy Prophet) at the end of the year and I was at that place near the Messenger of Allah (ﷺ) ; but I do not know whether he was the same person or another person, but he (the Holy Prophet) gave him the same reply
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 6:180