Musnad Ahmad 937:34

'Affan narrated to us, Shu'bah narrated to us, he said: 'Amr ibn Murrah informed me, from Sa'id ibn al-Harith, from Abu Dharr, from the Prophet, peace and blessings of Allah be upon him, who said: "It would not please me to have the equivalent of Mount Uhud in gold, such that I die on the day I die while having a dinar or half a dinar of it, except that I would keep it for a creditor."