1 It is actually reported that there is sexual immorality among you, and of a kind that is not tolerated even among pagans, for a man has his father’s wife.
2 And you are arrogant! Ought you not rather to mourn? Let him who has done this be removed from among you.
And now we get an example of the sort of false teaching that Paul is concerned about. The church is always being attacked for not being lenient enough toward sexual immorality but here Paul is clear that we are not lenient about these matters. This fellow he uses as an example, some guy who has been sleeping with his fathers wife is to be removed from the church. (It is to be pointed out however that in the second letter this fellow seems to have repented and is to be forgiven).