Musannaf Ibn Abi Shayba 27:101

Abu Mu’awiyah narrated to us, he said: Ishaq bin Abdullah bin Abi Farwah narrated to us, from Sa’id bin Abi Sa’id, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I asked for intercession for my Ummah, and He said: 'You shall have seventy thousand who will enter Paradise without reckoning.' I said: 'Increase me.' He said: 'You shall have, with every thousand, seventy thousand.' I said: 'Increase me.' He said: 'You shall have thus and thus.'" Abu Bakr said: "That is sufficient for us." Umar said: "O Abu Bakr, let the Messenger of Allah (peace and blessings of Allah be upon him) be." Abu Bakr said: "O Umar, we are but a handful from the handfuls of Allah."