Musannaf Ibn Abi Shaybah 39564 — The Battle of the Trench

Muhammad said: I heard Isma'il bin Muhammad bin Sa'd, when he came in to us in the tent while we were burying Waqid bin Amr bin Sa'd bin Mu'adh, say: "Shall I not tell you what I heard from our elders? I heard our elders relating that the Messenger of Allah (peace and blessings be upon him) said on the day Sa'd died: 'Seventy thousand angels have come down and attended the funeral of Sa'd; they had never trodden the earth before this day.'"