Musnad Ahmad 508:2

Abd al-Samad narrated to us, from Hisham, from Yahya ibn Abi Kathir, from Abu Ibrahim, from his father: that he narrated to him that he heard the Messenger of Allah, may Allah bless him and grant him peace, saying during the funeral prayer: "O Allah, forgive our living and our dead, our present and our absent, our male and our female, and our young and our old."