Musnad Ahmad 31:466

'Abd al-Samad narrated to us, Aban narrated to us, Sa'id ibn Yazid narrated to us, from Abu Nadra, from Abu Sa'id al-Khudri, from the Prophet, peace and blessings of Allah be upon him: "There will be a Caliph after me who will scoop up wealth in handfuls, and he will not count it by number."