Is the saying "The Prophet - peace and blessings be upon him - advised concerning the the seventh neighbor" authentic, and what is meant by the seventh neighbor if it is authentic?

Islam has enjoined good treatment of neighbors and encouraged their honorable reception. Allah Almighty says: "Worship Allah and associate nothing with Him, and to parents do good, and to relatives, orphans, the needy, the near neighbor, and the distant neighbor." The Prophet, peace and blessings be upon him, said: "Whoever believes in Allah and the Last Day should honor his neighbor," and "Gabriel kept on enjoining me to treat my neighbor well until I thought that he would make him an heir." The boundary of neighborhood is forty houses, and there is no specific injunction regarding the seventh neighbor.