Is shunning/disfellowshipping biblical in Protestant churches?

Is this practice supported by the Christian bible ? Please argument your response with biblical support. We have this practice in our Pentecostal church and no matter from which angle I view it, I cannot personally accept it as being a right thing to do. -- Update It's the situation when a a member sins (minor to major) against others or himself and it's separated (not removed completely) from the church for a specific period of time (in months). During this time, he must repent and finally get back after the end of period. However, church leaders and members are supposed to see the results of his repentance otherwise it will get difficult. For example: If you serve in the church and commit a visible sin, you are separated/put away and at some extent cannot serve anymore depending on the gravity of the sin, even after the end of period. Regards