(27) باب الأَمْرِ بِالْوِتْرِ
It was narrated that Ali, may Allah (SWT) be pleased with him, said:
"Witr is not essential like the obligatory prayers, but it is the sunnah of the Messenger of Allah (ﷺ)." (IT)
Reference (IT): Sunan an-Nasa'i 1676 (IT)
In-book reference (IT): Book 20, Hadith 79 (IT)
English translation (IT): Vol. 2, Book 20, Hadith 1677 (IT)