Matthew 10:28; 2 Thessalonians 1:9; Revelation 21:8

Matthew 10:28

28 Do not be afraid of those who kill the body but cannot kill the soul. Rather, be afraid of the One who can destroy both soul and body in hell.

2 Thessalonians 1:9

9 They will be punished with everlasting destruction and shut out from the presence of the Lord and from the glory of his might

Revelation 21:8

8 But the cowardly, the unbelieving, the vile, the murderers, the sexually immoral, those who practice magic arts, the idolaters and all liars—they will be consigned to the fiery lake of burning sulfur. This is the second death.”