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 deceased Muslims. O Allah! Grant forgiveness to the believing men and believing women, and also to the Muslim men and Muslim women, and set right their mutual affairs, and make their hearts like the hearts of their best people. O Allah! Forgive the sins of so-and-so son of so-and-so and unite him with Your Prophet Muhammad (peace and blessings be upon him). O Allah! Raise his rank among the rightly guided, and be the successor for him among those who remain behind, and place his record of deeds in Illiyin. Lord of all the worlds, forgive us and him. O Allah! Do not deprive us of his reward, and do not let us go astray after him.