Allah Almighty Created Heaven to represent His Mercy, and Hell to represent His Punishment:
Narrated Abu Huraira: "The Prophet said, 'Paradise and Hell (Fire) quarreled in the presence of their Lord. Paradise said, 'O Lord! What is wrong with me that only the poor and humble people enter me ?' Hell (Fire) said, I have been favored with the arrogant people.' So Allah said to Paradise, 'You are My Mercy,' and said to Hell, 'You are My Punishment which I inflict upon whom I wish, and I shall fill both of you.' ' The Prophet added, 'As for Paradise, (it will be filled with good people) because Allah does not wrong any of His created things, and He creates for Hell (Fire) whomever He will, and they will be thrown into it, and it will say thrice, 'Is there any more, till Allah (will put) His Foot over it and it will become full and its sides will come close to each other and it will say, 'Qat! Qat! Qat! (Enough! Enough! Enough!).' (Translation of Sahih Bukhari, ONENESS, UNIQUENESS OF ALLAH (TAWHEED), Volume 9, Book 93, Number 541)"
Narrated Anas: "The Prophet said, 'Some people who will be scorched by Hell (Fire) as a punishment for sins they have committed, and then Allah will admit them into Paradise by the grant of His Mercy. These people will be called, 'Al-Jahannamiyyiin' (the people of Hell).' (Translation of Sahih Bukhari, ONENESS, UNIQUENESS OF ALLAH (TAWHEED), Volume 9, Book 93, Number 542)"
In the above Sayings of our beloved Prophet Muhammad peace be upon him, we clearly see that Allah Almighty Created Heaven for Mercy and Hell for Punishment. Those who will enter Hell at first and then be granted Heaven by the Mercy of Allah Almighty will be called "Al-Jahannamiyyiin".
It is important to know that Allah Almighty's Mercy is bigger than His Anger:
Narrated Abu Huraira: "Allah's Apostle said, 'When Allah completed the creation, He wrote in His Book which is with Him on His Throne, 'My Mercy overpowers My Anger.' ' (Translation of Sahih Bukhari, Beginning of Creation, Volume 4, Book 54, Number 416)"
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