Reading Witr After Fajr
by The Albaani Site
The Imaam said, “Someone who falls asleep or who forgets [to pray witr] can pray it after Fajr, i.e., [he prays it] at the time he remembers it. As for someone who knows, then the time for his witr ends with the appearance of fajr, and this is obvious and clear.”
Irwaa al-Ghaleel, under hadith no. 422.