(2) باب فِيمَنْ لَمْ يُوتِرْ
Narrated Buraydah ibn al-Hasib:
I heard the Messenger of Allah (ﷺ) say: The witr is a duty, so he who does not observe it does not belong to us; the witr is a duty, so he who does not observe it does not belong to us; the witr is a duty, so he who does not observe it does not belong to us. (RU)
Reference (RU): Sunan Abi Dawud 1419 (RU)
In-book reference (RU): Book 8, Hadith 4 (RU)
English translation (RU): Book 8, Hadith 1414 (RU)