Musannaf Ibn Abi Shaybah 7391 — A man who prays Fajr and then finds

Nafi' said: Sayyiduna Ibn Umar (may Allah be pleased with them both) repeated the Fajr prayer three times in one day at Jam' (Muzdalifah). He finished the prayer and it became clear that he had prayed before dawn, so he repeated the prayer. Then he prayed and finished, and it became clear that dawn had still not broken, so he prayed it a third time.