Like Christianity, Tibetan Buddhism describes hell as a realm of ceaseless suffering. But look following question:
"Q: Is hell permanent, or can one accumulate merit and work one's way out?
A:One can work one's way out through karma. This is the subject of another article, and believe me, it would be a long article. But, yes, one can work one's way out."
In the Islamic world, Heaven and Hell are everlasting realities, but not everyone who goes to Hell stays there forever. Presumably unbelievers and the really bad will remain in Hell forever. Believers who lived a somewhat bad lives will stay there for a while. So, for some Moslems Hell appears as a kind of purgatory.
The following passages from the Koran confirm the above.
"Whoso slayeth a believer of set purpose, his reward is Hell forever. (Sura 4:93)
Lo! the guilty are immortal in hell's torment. It is not relaxed for them, as they despair therein. ....And they cry: O master! Let thy Lord make an end of us. He saith: Lo! here ye must remain. (Sura 43:74, 75,77)
"And for those who will be wretched (on that day) they will be in Fire; sighing and wailing will be their portion therein, abiding therein as long as the heavens and earth endure save for that which the Lord willeth. Lo! they Lord is doer of what He will." (Sura XI:106-107)
"Lo! Hell lurketh in ambush, A home for the rebellius. They will abide therein for ages." (Sura LXXVIII: 21-23)
How do we know that Hell lasts forever?
First of all we have assurance of Christ who said, "And these will go off to eternal punishment,...." (Mt. 25:46)
Secondly, we base our conclusion of three fundamental presuppositions which are:1. God is eternal.
2. Man is meant to live on forever.
3. Man's final decision at death cannot be changed.
Justice of God