(Recording of this lesson is unavailable.)
The unrighteous shall not inherit the kingdom of God. Paul is not the first to point this out in scripture. God's wrath is revealed against the unrighteous in the Bible. For us in Christ, we've been counted righteous by believing what Christ did on Calvary's cross on our behalf. Therefore, Paul can list the Corinthian's wicked behaviors and confidently declare, "such were some of you".
But why would He bring this up while rebuking them for shameful actions? Because they are not behaving as who they truly are in Christ Jesus, as saved members of the body of Christ. They need to be reminded that light ought not have fellowship with darkness.