Mu'jam Kabir Tabarani 9547 — I said to Sayyiduna Ubayy bin Ka'b: O Abu

Zirr said: I said to Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him): O Abu al-Mundhir, tell me about Laylat al-Qadr, for when our companion Sayyiduna Ibn Mas'ud (may Allah be pleased with him) was asked about it, he said: Whoever stands (in night prayer) the whole year will find it. He said: "May Allah have mercy on Abu Abd al-Rahman. By Allah, he knows that it is in Ramadan, but he disliked that people should rely (on it) - or he said: he wanted them not to rely on it. By Allah, it is indeed in Ramadan, and it is the twenty-seventh night" - he was swearing and not saying 'In sha' Allah'. I said: O Abu al-Mundhir, how did you come to know that? He said: "By the sign that the Messenger of Allah (peace and blessings be upon him) told us of." Hammad said: I asked Asim: What is the sign? He said: "On the morning of that night the sun rises without strong rays, like a basin, until it rises high."