Musannaf Ibn Abi Shaybah 39583 — The Battle of the Trench

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) came out one cold morning. The Muhajirun and the Ansar were digging the Trench. When his (peace and blessings be upon him) gaze fell on them, he said: "Indeed, life is the life of the Hereafter. So (O Allah) forgive the Ansar and the Muhajirun." The Companions said to him (peace and blessings be upon him) in reply: "We are those who pledged allegiance to Muhammad (peace and blessings be upon him) upon the duty of jihad as long as we remain."