A great reward

 For whom the Heaven is created?

Heaven is created for the pious people. 

What is a definition of piety here? 

Allah mentions it clearly. 

Those who spend in the way of Allah in their good as well as in their bad times, control their anger, forgive people; this is for Allah befriends with good people. And when they commit any immorality or a shameful act, they repent and remember Allah and ask Him forgiveness for who else is there who will forgive except Allah and whatever they did they knowingly don’t remain stubborn of doing the same act again. For them is the forgiveness and the heaven beneath of which streams flow and they would live there forever and for them there is a great reward.