Deuteronomy 4:19 & Malachi 1:11.
I agree with most of Jim’s statement but I do agree with what you two are getting at as well. Most Christians do believe in an eternal punishment or torment for sinners and those who do not overcome in hell. I believe, as it is written in Matthew 10:28, that body and soul are destroyed at that time of God’s judgment on them. They are turned to ashes from within, as Satan himself will be.