(30) باب وَقْتِ الْوِتْرِ
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."
Reference: Sunan an-Nasa'i 1682
In-book reference: Book 20, Hadith 85
English translation: Vol. 2, Book 20, Hadith 1683