Sahih Muslim Book 006, Hadith Number 2633.

Chapter : Excellence of Lailat-ul Qadar and exhortation to find it.

Zirr b. Habaish reported: I thus asked Ubayy b. Ka'b (Allah be pleased with him): Your brother (in faith) Ibn Mas'ud says: He who stands (for the night prayer) throughout the year would find Lailat-ul-Qadr, whereupon he said: May Allah have mercy upon him; (he said these words) with the intention that people might not rely only (on one night), whereas he knew that it (Lailat-ul-Qadr) is in the month of Ramadan and it is the twenty-seventh night. He then took oath (without making any exception, i.e. without saying Insha Allah) that it was the twenty-seventh night. I said to him: Abu Mundhir, on what ground do you say that? Thereupon he said: By the indication or by the sign which the Messenger of Allah (may peace be upon him) gave us, and that is that on that day (the sun) would rise without having any ray in it.

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