Sahih Bukhari Volume 004, Book 052, Hadith Number 182.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 52. Fighting for the Cause of Allah (Jihaad)
Narated By 'Ali : When it was the day of the battle of Al-Ahzab (i.e. the clans), Allah's Apostle said, "O Allah! Fill their (i.e. the infidels') houses and graves with fire as they busied us so much that we did not perform the prayer (i.e. 'Asr) till the sun set."