Sahih Muslim Book - 6, Hadith - 1760

وَحَدَّثَنَا أَبُو كُرَيْبٍ وَهَارُونُ بْنُ عَبْدِ اللَّهِ قَالاَ حَدَّثَنَا أَبُو أُسَامَةَ عَنِ الْوَلِيدِ بْنِ كَثِيرٍ قَالَ حَدَّثَنِى عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُمَرَ أَنَّ ابْنَ عُمَرَ حَدَّثَهُمْ أَنَّ رَجُلاً نَادَى رَسُولَ اللَّهِ -صلى الله عليه وسلم- وَهُوَ فِى الْمَسْجِدِ فَقَالَ يَا رَسُولَ اللَّهِ كَيْفَ أُوتِرُ صَلاَةَ اللَّيْلِ فَقَالَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- « مَنْ صَلَّى فَلْيُصَلِّ مَثْنَى مَثْنَى فَإِنْ أَحَسَّ أَنْ يُصْبِحَ سَجَدَ سَجْدَةً فَأَوْتَرَتْ لَهُ مَا صَلَّى ». قَالَ أَبُو كُرَيْبٍ عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ. وَلَمْ يَقُلِ ابْنِ عُمَرَ.

'Ubaidullah bin 'Abdullah bin 'Umar narrated that Ibn 'Umar told them that a man called out to the Messenger of Allah (s.a.w) when he was in the Masjid, saying: "O Messenger of Allah, how should I make my prayer at night odd-numbered?" The Messenger of Allah (s.a.w) said: "Whoever prays, let him pray two by two, then when he feels that dawn is coming, let him offer one Rak'ah, and that will make what he had prayed odd-numbered for him."