Ibn Umar said: A man who lived in the desert asked the Messenger of Allah ﷺ about the prayer at night. He made a sing with his two fingers-in this way in pairs. The witr consists of one rak'ah towards the end in night.
Hadith ReferenceSunan Abi Dawud / Prayer (Kitab Al-Salat): Detailed Injunctions about Witr / Hadith: 1421
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم (749)