Zirr says: I said to Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him): Tell me about the Night of Qadr. Umm Abd's son, that is, Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), says that whoever stands (in prayer) throughout the year will surely find that night. Sayyiduna Ubayy (may Allah be pleased with him) said: May Allah have mercy on Abu Abdur Rahman, Sayyiduna Ibn Mas'ud (may Allah be pleased with him), he knows very well that this night is in the month of Ramadan and it is the twenty-seventh night. In fact, he concealed the determination of this night from the people so that they would not suffice with it (and abandon standing in prayer on the other nights). By Allah, Who sent down the Book upon Muhammad (peace and blessings be upon him), this night is the twenty-seventh night of Ramadan. I said to Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him): O Abu Mundhir! How did you come to know this? He said: The Messenger of Allah (peace and blessings be upon him) told us a sign, then we counted it and remembered it well. By Allah, it is this very night. Zirr said: Sayyiduna Ubayy did not make any exception (he did not even say "insha'Allah"). I (Asim) said to Zirr: What is that sign? He said: It is that on the morning following the Night of Qadr, the sun appears like a flat dish, it has no rays, until it rises high.