Abu Sa'eed Al-Khudri narrated that the Messenger of Allah (salAllahu alayhi wasalam) said,
"The people of Paradise will look at the dwellers of lofty mansions (i.e. a superior place in Paradise) in the same way as one looks at a brilliant star, far away in the East or in the West of the horizon. This is because of their superiority over one another (in reward)." One of the people asked, "O Allah's Messenger, are these lofty mansions for the Prophets which no one else can reach?"
The Prophet (salAllahu alayhi wasalam) replied, "No! By Allah, in whose Hands is my life, these are for men who believe in Allah and also believe in the Messenger." [Bukhari and Muslim]