Musnad Abu Ya'la al-Mawsili 3:132

Zuhayr ibn Harb narrated to us, Abu Mu'awiyah narrated to us, al-A'mash narrated to us, from Muslim ibn Sabih, from Shutayr ibn Shakl, from Ali, who said: The Messenger of Allah (may Allah bless him and grant him peace) said on the day of the Confederates (al-Ahzab): "They distracted us from the middle prayer, the afternoon prayer (Asr). May Allah fill their graves, their houses, and their bellies with fire." Then he prayed it between the two evening prayers, between Maghrib and Isha.