Hadith 1668

It was narrated from Salim, from his father, that : The Prophet (SAW) said: "Prayers at night are two by two, then if you fear that dawn will come, pray witr with one rak'ah."

أَخْبَرَنَا عَمْرُو بْنُ عُثْمَانَ، وَمُحَمَّدُ بْنُ صَدَقَةَ، قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ حَرْبٍ، عَنِ الزُّبَيْدِيِّ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ صَلاَةُ اللَّيْلِ مَثْنَى مَثْنَى فَإِذَا خِفْتَ الصُّبْحَ فَأَوْتِرْ بِوَاحِدَةٍ ‏"‏ ‏.‏

Reference: 1116760
In-book reference: Book 20, Hadith 1668
Hadith 1668 - The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day - Sunan an-Nasa'i - Sunnah.com