Bukhari Collection: ::Book Number 6:: Hadith # 532
Narrated Aslam:Allah's Apostle was traveling on one of his journeys, and `Umar bin Al-Khattab was traveling along with him at night. `Umar asked him about something, but Allah's Apostle I did not answer him. He asked again, but he did not answer. He asked for the third time!, but he did not answer. On that, `Umar said to himself, "May your mother lose you! You have asked Allah's Apostle three times, but he did not answer at all!" `Umar said, "So I made my camel go fast till I was ahead of the people, and I was afraid that something might be! revealed about me. After a little while I heard a call maker calling me, I said, 'I was afraid that some Qur'anic Verse might be revealed about me.' So I went to Allah's Apostle and greeted him. He said, 'Tonight there has been revealed to me a Surah which is dearer to me than that on which the sun shines (i.e. the world).' Then he recited: 'Verily! We have given you (O Muhammad I, a manifest victory.' " (Surat al-Fath) No. (48.1).