(20) The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
كتاب قيام الليل وتطوع النهار
(30) Chapter: The time for witr
(30) باب وَقْتِ الْوِتْرِ
Sunan an-Nasa'i 1682 
It was narrated that Ibn 'Umar said:
"Whoever prays during the night, let him make the last of his prayers at night witr, because the Messenger of Allah (ﷺ) used to enjoin that."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، قَالَ مَنْ صَلَّى مِنَ اللَّيْلِ فَلْيَجْعَلْ آخِرَ صَلاَتِهِ وَتْرًا فَإِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَأْمُرُ بِذَلِكَ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Sunan an-Nasa'i 1682
In-book reference : Book 20, Hadith 85
English translation : Vol. 2, Book 20, Hadith 1683