Musnad Ahmad 1007:27

Yazid ibn Harun narrated to us, Muhammad ibn Amr informed 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 Prophet, 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, "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.