Ibn Umar narrated that : Allah's Messenger said: "When Fajr begins, then every Salat of the night and Al-Witr have gone, so perform Al-Witr before Fajr begins"
SahihSahihIsnaad SahihBook 3 · Hadith 17
جامع الترمذي
Ibn Umar narrated that : Allah's Messenger said: "When Fajr begins, then every Salat of the night and Al-Witr have gone, so perform Al-Witr before Fajr begins"