Concerning the prohibition to harm Neighbour

It is narrated on the authority of Abu Huraira that the Messenger of Allaah (may peace and blessing be upon him) observed: He will not enter Paradise whose neighbour is not secure from his wrongful conduct.  (Muslim, 74)

Lessons to learn from this Hadith

Prophet Mohammad (SAW) has mentioned neighbour- He did not mention muslim or non-muslim. So we all have to be good to our neighbours no matter if they are muslims or not.