Musnad Ahmad 5:585

Hajjaj narrated to us, Shu'bah narrated to me, he said: I heard Qatadah, he said: I heard Abu Hassan narrating from 'Ubaydah, from 'Ali, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said on the day of the Confederates (al-Ahzab): "They distracted us from the middle prayer until the sun set. May Allah fill their graves and their houses—or their bellies—with fire." (The narrator) was in doubt regarding "houses" and "bellies," but as for "graves," there is no doubt in it.