Musnad Ahmad 1153:1193

Abu Abd al-Rahman al-Muqri narrated to us, Sa'id—meaning Ibn Abi Ayyub—narrated to us, 'Aqil narrated to me, from Ibn Shihab, from Abu Salamah ibn 'Abd al-Rahman, from 'Aishah, that she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever among my Ummah takes on a debt, then strives to pay it off, then dies before paying it off, then I am his guardian."