The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1314
'Ali reported: The Messenger of Allah (may peace be upon him) said on the day (of the Battle) of Ahzab: They diverted us from saying the middle prayer, i. e. the 'Asr prayer. May Allah fill their houses and graves with fire; he then observed this prayer between the evening prayer and the night prayer.