Trouble from Within - Ezra 4: 1- 5

As Christians, we expect to have trouble from the unbelieving world. But what happens when they trouble comes from within - from people who claim to be believers just like us? Zerubbabel and Joshua were up against this exact thing with the Samaritans in Jerusalem. What does their situation show us about what we can sometimes come up against? And what can we learn about how to handle these situations?