Musnad Abu Ya'la al-Mawsili 155:352

Abu Khaythama narrated to us, Jarir narrated to us, from Yunus, from Abu Hazim, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "No servant seeks refuge from the Fire seven times in a day, except that the Fire says: 'O Lord, Your servant so-and-so has sought refuge in You from me, so grant him refuge.' And no servant asks Allah for Paradise seven times in a day, except that Paradise says: 'O Lord, Your servant so-and-so has asked for me, so admit him.'"