Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Anas (may Allah be pleased with him), he says: Sayyiduna Ubadah bin Samit (may Allah be pleased with him) informed me that the Messenger of Allah (peace and blessings be upon him) came out to inform about (the exact date of) Laylat al-Qadr. (On the way, he saw that) two Muslim men were arguing. The Prophet (peace and blessings be upon him) said: "I came out to inform you about Laylat al-Qadr, but so-and-so were arguing, so (its signs or its determination) was taken away because of that. Perhaps this is better for you. Now seek it in the twenty-seventh, twenty-ninth, and twenty-fifth nights."