Sunan Abi Dawud 1378

Sulayman ibn Harb and Musaddad—both giving the same meaning—narrated to us: Hammad ibn Zayd narrated to us, from Asim, from Zirr, who said: I said to Ubayy ibn Kab: Tell me about Laylat al-Qadr, Abu al-Mundhir, for our companion was asked about it. He said: Whoever keeps standing in prayer throughout the year will encounter it. He said: May Allah have mercy on Abu Abd al-Rahman. By Allah, he knew that it is in Ramadan—Musaddad added: but he disliked people relying on it, or wanted them not to rely on it; then they agreed—and by Allah, it is in Ramadan, on the twenty-seventh night, without exception. I said: Abu al-Mundhir, how did you know that? He said: By the sign that the Messenger of Allah (peace and blessings be upon him) told us. I asked Zirr: What is the sign? He said: The sun rises on the morning after that night like a basin, with no rays, until it has risen higher.