Musnad Ahmad

Abu Murthad says that I asked Hazrat Abu Dharr (may Allah be pleased with him), "Did you ask the Prophet Muhammad (peace be upon him) about the Night of Qadr?" He replied, "I was the one who asked the most about it. I asked, 'O Messenger of Allah! Tell me, is the Night of Qadr in the month of Ramadan or in some other month?' The Prophet (peace be upon him) said, 'No, rather it is in the month of Ramadan.' I asked, 'Did it remain with the previous Prophets (peace be upon them) as long as they were Prophets, and when they passed away it was lifted, or will it remain until the Day of Resurrection?' The Prophet (peace be upon him) said, 'No! It will remain until the Day of Resurrection.' I asked, 'In which part of Ramadan does the Night of Qadr occur?' The Prophet (peace be upon him) said, 'Seek it in the first ten or the last ten.' Then the Prophet (peace be upon him) began to narrate a hadith, and during this I was overcome by drowsiness. When I became alert, I asked, 'In which twenty nights does it occur?' The Prophet (peace be upon him) said, 'Seek it in the last ten nights, and do not ask me any more questions.' The Prophet (peace be upon him) began to narrate a hadith again, and I was again overcome by heedlessness. When I became alert, I said, 'O Messenger of Allah (peace be upon him), I ask you by the right I have over you, tell me in which ten nights it occurs?' At this, the Prophet (peace be upon him) became so angry that since I had been in his company, I had never seen him so angry, and he said, 'Seek it in the last seven nights, and do not ask me any more questions.'"