Elisha had asked Elijah if he could have a double portion of his spirit. Afterwards, those youths were making fun of him so he cursed them. He was a prophet. It has nothing to do with church discipline- duh as you so eloquently put it.<quoted text>You know where I believe you keep your head. Look back at my post 78. You will see I said with the situation of Elisha that they were not Christians. Duh !!!! it could hardly have anything to do with church discipline could it.
The two passages of Matthew 18 and 1 Corinthians 5 are dealing with church discipline; and are under another covenant; and is addressed concerning Christians not the pagans; so that needs to be kept in mind.
I see nothing that requires the death of the offender in 1 Corinthians 5. Nor necessarily the infliction of bodily harm. Excommunication is absolutely in sight here, as the rest of the chapter shows us. I don't see that the Ananias and Sapphira passage really has any involvement in this either.
Nor do I see an apostolic only power here, as Paul tells them they should excommunicate the offending party without his being present there. He states he is with them in spirit, agrees with their judgment, but not there in physical presence. Hence the tie in with Matthew 18.