Musannaf Ibn Abi Shayba 3:6219

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from al-A'mash, from Muslim, 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 houses and their graves with fire." Then he prayed it between the two evening prayers, between Maghrib and Isha.