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]. (DE)
App reference (DE): Book 20, Hadith 22 (DE)
Arabic/English book reference (DE): Book 20, Hadith 1890 (DE)