The Repentance - 9:68 Allah promises the hypocritical men and hypocritical women and the disbelievers the Fire of Hell where they will abide forever. It is sufficient for them. Allah has cursed them and for them is an inexhaustible torment.
Eternal torment:
Prophet Hud/11:106 The unfortunate are in the Fire. They will groan therein.
Prophet Hud/11:107 They will abide therein as long as the heavens and the earth endure, except if your Lord wills. Your Lord is the Doer of whatever He wills

The Heights/7:40 The gates of heaven will not open for those who deny Our Verses and are arrogant against them, and they will not enter Paradise until the camel passes through the eye of a needle. This is how We punish the guilty.

Prophet Abraham/14:17 He will try to swallow it, but he will not be able to choke it down. Death will come to him from all sides, but he will not die. And a severe torment will follow.

Originator/35:36 For those who disbelieve is the Fire of Hell. They will not be allowed to die, nor will the punishment of Hell be lightened for them. This is how We punish the ungrateful.

The Ornaments of Gold/43:77 "They call out, "O Malik, let your Lord finish us". He says: "You will remain like this"."