Jami` at-Tirmidhi Book 47, Hadith 403
“I said to Ubayy bin Ka’b: ‘Your brother Abdullah bin Mas’ud says: “Whoever stands (in voluntary prayer) the whole year, then he will have reached the Night of Al-Qadr.’” So he said: ‘May Allah forgive Abu Abdur-Rahman. He knows that is during the last ten (nights) of Ramadan, and that it is the night of the twenty-seventh. But he wanted the people to not rely upon that.’ Then he uttered an oath, that without exception it is on the night of the twenty-seventh.” He said: “I said to him: ‘Why is it that you say that O Abu Al-Mindhir?’ He said: “By the sign or indication which the Messenger of Allah informed us of: ‘That the sun rises on that day having no beams with it.’”
“A man stood up in front of Al-Hasan bin Ali, after he pledged to Mu’awiyah, so he said: ‘You have made fools of the believers.’ – or: ‘O you who has made fools of the believers’ – So he said: ‘Do not scold me so, may Allah have mercy upon you, for indeed the Prophet had a dream in which he saw Banu Umayyah upon his Minbar. That distressed him, so (the following) was revealed: Verily We have granted you Al-Kauthar (O Muhammad) meaning a river in Paradise, and (the following) was revealed: ‘Verily We have sent it down on the Night of Al-Qadr. And what will make you know what the Night of Al-Qadr is? The Night of Al-Qadr is better than a thousand months, in which Banu Umayyah rules after you O Muhammad.” Al-Qasim said: “So we counted them, and found that they were one-thousand months, not a day more nor less.”
A man said to the Prophet: “O best of creatures!” So he said: “That is Ibrahim.”