Musnad Ahmad 31:349

'Abd al-Samad ibn 'Abd al-Warith narrated to us, my father narrated to me, Dawud narrated to us, from Abu Nadra, from Abu Sa'id and Jabir, they both said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There will be in the end of time a Caliph who will distribute wealth and will not count it."