This article offers a fresh interpretation of the intended impact of 2 Cor 6:14–7:1 on the group formation of the Corinthian Christ community. To achieve this interpretation, it will first determine the most likely social reference of the term οἱ ἄπιστοι. Secondly, it will describe a methodological tool from the Social Identity Approach that will help to visualise how groups are formed and reformed when the context changes. Finally, it will apply this tool to determine how 2 Cor 6:14–7:1 affected the boundaries of the Christ community in Corinth.