1 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. -Revelation 21:8
2 And the smoke of their torment goes up forever and ever, and they have no rest, day or night... -Revelation 14:11
3 …be thrown into hell, where the worms that eat them do not die, and the fire is not quenched. -Mark 9:48
4 …throw them into the blazing furnace, where there will be weeping and gnashing of teeth. -Matthew 13:50
This verse has double meaning. The first is obvious: the suffering will be so great, people will be gnashing their teeth and weeping. The second meaning: demons will literally be gnashing their teeth on people.
5 They will be punished with everlasting destruction and shut out from the presence of the Lord and from the glory of his might. -2 Thessalonians 1:9
6 The wicked go down to the realm of the dead, all the nations that forget God. -Psalms 9:17
This is why Christian God is evil
7 For if God did not spare the angels when they sinned, but cast them into hell and committed them to chains of darkness... -2 Peter 2:4
8 And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever. - Revelation 20:10
9 And besides all this, between us and you a great chasm has been fixed, in order that those who would pass from here to you may not be able, and none may cross from there to us. -Luke 16:25
Obviously, the torment will be mental as well as physical.
10 Anyone whose name was not found written in the book of life was thrown into the lake of fire. -Revelation 20:15