´It was narrated from Ibn 'Umar that:` A man from among the people of the desert asked the Messenger of Allah (ﷺ) about prayer at night. He said:"(It is) two by two, and Witr is one rak'ah at the end of the night."
Hadith ReferenceSunan an-Nasa'i / The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day / Hadith: 1692
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم