(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. (ID)
Reference (ID): Sunan Abi Dawud 1419 (ID)
In-book reference (ID): Book 8, Hadith 4 (ID)
English translation (ID): Book 8, Hadith 1414 (ID)