Musnad Ahmad 5:679

'Abd al-Razzaq narrated to us, Sufyan informed us, from al-A'mash, from Abu al-Duha, from Shutayr ibn Shakl al-'Absi, who said: I heard 'Ali saying: On the day of the Confederates (al-Ahzab), we prayed the 'Asr prayer between the Maghrib and the 'Isha. The Prophet, peace and blessings of Allah be upon him, said: "They distracted us from the middle prayer, the 'Asr prayer; may Allah fill their graves and their bellies with fire."