Musnad Ahmad 33:721

Ibrahim ibn Abi al-Abbas narrated to us, Abu al-Malih narrated to us, Abdullah ibn Muhammad ibn Aqil ibn Abi Talib narrated to us, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There will emerge upon you from beneath this wall a man from the people of Paradise." He said: Then Abu Bakr emerged upon them, so we congratulated him for what the Messenger of Allah (peace and blessings of Allah be upon him) had said. Then he waited a short while, then he said: "There will emerge upon you from beneath this wall a man from the people of Paradise." He said: Then Umar emerged. He said: So we congratulated him for what the Messenger of Allah (peace and blessings of Allah be upon him) had said. He said: Then he said: "There will emerge upon you from beneath this wall a man from the people of Paradise; O Allah, if You will, make it Ali," three times. Then Ali emerged.