Musannaf Ibn Abi Shaybah 9308 — A man who doubts whether dawn has

Makhul said: I saw Sayyiduna Ibn Umar (may Allah be pleased with them both) draw a bucket of water from Zamzam. He said to two men: "Has dawn broken?" One of them said: "No," and the other said: "Yes." At that, Sayyiduna Ibn Umar drank the water.