Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)

Bukhari :: Book 5 :: Volume 59 :: Hadith 437

Narrated 'Ali:

On the day of Al-Khandaq (i.e. Trench), the Prophet said '(Let) Allah fill their (i.e. the infidels') houses and graves with fire just as they have prevented us from offering the Middle Prayer (i.e. 'Asr prayer) till the sun had set."