Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "In Jannah there are a hundred grades which Allah has prepared for those who fight in His Cause; and the distance between any two of those grades is like the distance between the heaven and the earth."[Al-Bukhari].
App reference: Book 12, Hadith 16
Arabic/English book reference: Book 12, Hadith 1300