Sahih Muslim Book 4, Hadith Number 1313.
Chapter : Preference for saying the ‘Asr prayer at the commencement of the prescribed time.
Yahya heard ‘Ali saying that the Messenger of Allah (may peace be upon him) said on the day (of the Battle) of Ahzab, while sitting in one of the openings of the ditch: They (the enemies) have diverted us from the middle prayer till the sun set. May Allah fill their graves and their houses with fire, or their graves and stomachs with fire.