Musnad Ahmad 1007:70

Ya'la ibn 'Ubayd narrated to us, Muhammad ibn 'Amr narrated to us, from Sa'id ibn Abi Sa'id al-Maqburi, from 'Abdullah ibn Abi Qatadah, from his father, who said: A funeral was brought to the Messenger of Allah, may Allah bless him and grant him peace, for him to pray over it. He said: "Does he have any debt?" They said: "Yes, two dinars." He said: "Did he leave behind anything to pay them off?" They said: "No." He said: "Then pray over your companion." Abu Qatadah said: "They are upon me, O Messenger of Allah." So the Prophet, may Allah bless him and grant him peace, prayed over him.