Musnad Ahmad 32:642

Aswad ibn Amir narrated to us, Yunus—meaning ibn Abi Ishaq—informed us, from Burayd ibn Abi Maryam, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "No Muslim man asks Allah for Paradise three times, except that Paradise says: 'O Allah, admit him into Paradise.' And no one seeks refuge from the Fire three times, except that the Fire says: 'O Allah, grant him refuge from the Fire.'"