It wasnarrated that Ibn 'Umar said:
"The Prophet (ﷺ) was askedaboutthe night prayer. He said: 'Pray two by two, and if you fearthatdawn is coming, then perform Witr with one Rak'ah.'" (RU)
English reference (RU): Vol. 1, Book 5, Hadith 1320 (RU)
Arabic reference (RU): Book 5, Hadith 1381 (RU)