Musannaf Ibn Abi Shaybah

Hazrat Ibn Umar (may Allah be pleased with them both) and Ibn Ghailan narrate that Hazrat Abu Darda used to recite this supplication in the funeral prayer: O Allah, forgive our living and our deceased among the Muslims. O Allah, forgive the Muslim men and women, and the believing men and women, and reconcile their mutual affairs, and unite their hearts, and make their hearts upon the hearts of their best ones. O Allah, forgive so-and-so son of so-and-so his sins, and join him with his Prophet Muhammad (peace and blessings of Allah be upon him). O Allah, raise his rank among the guided, and appoint his successor among those left behind, and place his record in Illiyyin, and forgive us and him, O Lord of the worlds. O Allah, do not deprive us of his reward, and do not misguide us after him.