Musnad Abu Ya'la al-Mawsili 159:113

'Ata' ibn Yazid said, and Abu Sa'id was with Abu Hurayrah, listening to his hadith, not refuting anything from it, until when he said: "For you is this and the like of it with it," Abu Sa'id said: "For you is this and ten times its like." Abu Hurayrah said: "I did not memorize from his statement except: 'For you is this and the like of it with it.'" Abu Sa'id said: "I bear witness that I memorized from the Messenger of Allah, may Allah bless him and grant him peace, that he said: 'It is for you and ten times its like.'" Abu Hurayrah said: "So that is the last man to enter Paradise."