Musannaf Ibn Abi Shayba 6:557

Waki’ narrated to us, from Ibn Abi Layla, from a man from the people of Mecca, from Abu Salamah; and from ‘Ali ibn Mubarak, from Yahya, from Abu Salamah, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to say in the funeral prayer: "O Allah, forgive our living and our dead, our male and our female, those of us who are present and those who are absent, our young and our old. O Allah, whoever among us You keep alive, then keep him alive upon Islam, and whoever among us You cause to die, then cause him to die upon faith."