Sayyiduna Ali (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said on the day of the Battle of the Trench: "May Allah fill the hearts and graves of these disbelievers with fire, just as they kept us occupied from the middle prayer."
Hadith Referenceصحيح ابن خزيمه / جماع أبواب الأفعال المباحة فى المسجد غير الصلاة وذكر الله / 1336