Sahl bin Sa'd (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "The dwellers of Jannah will see the upper abodes of Jannah as you see the stars in the sky."[Al-Bukhari and Muslim]. (FR)
App reference (FR): Book 20, Hadith 22 (FR)
Arabic/English book reference (FR): Book 20, Hadith 1890 (FR)