Paul uses a question to emphasize that he is not the one to judge people outside the church. This can also be stated in active form. Alternate translation: "I am not the one who should judge people who do not belong to the church." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Paul is using a question to scold the Corinthians. Alternate translation: "you should know that you are the ones who should judge those who are inside the church." (See: [[rc://en/ta/man/translate/figs-rquestion]])