This verse mentions the final punishment as an everlasting destruction....2 Thess 1 : 7-9 : and give relief to you who are troubled, and to us as well. This will happen when the Lord Jesus is revealed in heaven in blazing fire with his powerful angels. He will punish those who do not know God and do not obey the gospel of our Lord Jesus. They will be punished with everlasting destruction and shut out from the presence of the Lord and from the majesty of his power .
This verse is similairJude 7 : In a similair way, Sodom and Gomorrah and teh surrounding towns gave themselves up to sexual immorality and perversion. They serve as an example of those who suffer the punishment of eternal fire
This verse however mentions the punishment as a "second death"Rev 20 :14-15 : The death and Hades were thrown into the lake of fire. the lake of fire is the second death. If anyone's name was not found written in the book of life, he was thrown into the lake of fire.
Perhaps the latter verse doesn't negate that the "second death" is eternal. But then how is death eternal? Does it mean a long eternal period in a process of dying? Or does it mean a person will for the rest of eternity be dead? Is hell eternal or not?