Matthew 10:28
fear not those who can only kill the body, but cannot hurt the soul: rather fear him who is able to destroy both soul and body in Gehenna.
Matthew 18:9
and if thine eye occasions thee to relapse, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two to be cast into hell-fire.
Matthew 23:33
ye serpents, ye brood of vipers, how can ye escape the punishment of Gehenna?
Mark 9:43-48
if even thy hand should make thee transgress, saw it off, and cast it away, it is better for thee to enter into life maimed, than to have both hands and go into Gehenna, the unextinguishable fire:
2 Thessalonians 1:8
in flaming fire, to take vengeance on those, who know not God, and do not obey the gospel of our Lord Jesus Christ:
Hebrews 12:29
for "our God is a consuming fire."