(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)." (ES)
Reference (ES): Sunan an-Nasa'i 1676 (ES)
In-book reference (ES): Book 20, Hadith 79 (ES)
English translation (ES): Vol. 2, Book 20, Hadith 1677 (ES)