Musannaf Ibn Abi Shaybah 34497 — Reports on Sad bin Muadh

Amr bin Shurahbil (may Allah have mercy on him) said: When Sayyiduna Sa'd bin Mu'adh (may Allah be pleased with him) was struck by an arrow on the day of the Battle of the Trench, his blood was flowing onto the Prophet (peace and blessings be upon him). Then Sayyiduna Abu Bakr (may Allah be pleased with him) came and began saying: "Alas, my back is broken!" At this the Prophet (peace and blessings be upon him) said: "O Abu Bakr!" Then Sayyiduna Umar (may Allah be pleased with him) came and recited: Inna lillahi wa inna ilayhi raji'un (We belong to Allah and to Him we return).