'Sin' in the Bible

God made the one who did not know sin to be sin for us, so that God's righteousness would be produced in us.

Did I commit a sin when I humbled myself by proclaiming to you the gospel of God free of charge, so that you could be exalted?

I am afraid that when I come my God may again humble me before you and that I may have to grieve over many who formerly lived in sin and have not repented of their impurity, sexual immorality, and promiscuity that they once practiced.