Abu Sa'id Al-Khudri (May Allah be pleased with him) reported:
The Prophet (ﷺ) said, "There was a dispute between Hell and Jannah, and Hell said: 'The haughty and proud are in me.' The Jannah said: 'In me are the weak and the humble.' Thereupon Allah, the Exalted, judged between them saying: 'You the Jannah are My Mercy, and through you I shall show mercy to those whom I wish.' (And addressing the Hell) He said: 'You are My punishment to punish whom I wish amongst My slaves, and each one of you will have its fill."'[Muslim].
Arabic/English book reference: Book 1, Hadith 615