<p>4:6 <i>Let no one transgress and wrong his brother in this matter. Because the Lord is an avenger in all these things, as also we forewarned you and testified</i>- This appears to be a direct and sober warning against using another brother's wife. The context before and after is clearly in this context. I noted on :3 that the immediate reference may be to cult prostitution, and perhaps the particular scenario in view was in that context. Again we note that Paul is backing up what he has verbally taught them during his brief presence with them- he had warned them and testified about these things. And yet later in this chapter we find a gap in their knowledge about the death state and resurrection. Clearly his focus when with them had been on teaching the life in Christ rather than theology.</p>