1 Corinthians 5:9-10

I wrote to you in the iggeret not to mix with those engaging in acts of zenut (fornication), Not meaning to completely disassociate from the zannayim of the Olam Hazeh or those guilty of chamdanut (greed) and the ones practicing hona'ah (swindling) or those guilty of avodah zarah (idol worship), als (since) in that case you would have to exit the Olam Hazeh.