Note 6 at 1 Cor. 5:5: Delivering this man to Satan for the destruction of his flesh was the last step in church discipline (see note 5 at Mt. 18:17, p. 277). There are two other men who Paul delivered unto Satan for this purpose (1 Tim. 1:20). This is the negative side of Jesus' statements in Matthew 18:18 and John 20:23.

Delivering a person unto Satan does not mean we are damning them to hell nor does it mean they are going to die physically. In this instance, we see by Paul's instructions in 2 Corinthians 2:6-7, that this man didn't die but repented and was restored back into the fellowship of the church.

This is a withdrawal of our intercession on the behalf of another and a retaining of their sins to them. This means they start reaping what they've sown because we aren't cancelling Satan's activities through our prayers. This is done in the hope that these "hard knocks" will bring them to their senses. (For a more detailed explanation see Mt. 18:17, p. 277).