سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 1678
The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Encouragement to pray witr before sleeping
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا مُحَمَّدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، ثُمَّ ذَكَرَ كَلِمَةً مَعْنَاهَا عَنْ عَبَّاسٍ الْجُرَيْرِيِّ، قَالَ سَمِعْتُ أَبَا عُثْمَانَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ أَوْصَانِي خَلِيلِي صلى الله عليه وسلم بِثَلاَثٍ الْوِتْرِ أَوَّلَ اللَّيْلِ وَرَكْعَتَىِ الْفَجْرِ وَصَوْمِ ثَلاَثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ .
It was narrated that Abu Hurairah said: "My closest friend advised me to do three things: 'To pray witr at the beginning of the night, to pray two rak'ahs of Fajr and to fast three days of each month.'"
Sunan an-Nasa'i, 1678Sahih (Darussalam)