Musannaf Ibn Abi Shaybah 34549 — The virtue of the Ansar

Sayyiduna Anas (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) came out early on a cold morning while the Muhajirun and the Ansar were digging the trench. When he (peace and blessings be upon him) looked at them, he recited this verse: "Beware! The true life is the life of the Hereafter. O Allah, forgive the Ansar and the Muhajirun." So the Companions (may Allah be pleased with them) recited this verse in reply: "We are the ones who have pledged allegiance to Muhammad (peace and blessings be upon him), to wage jihad for as long as we remain."