Sahih Bukhari

Narrated `Abdullah bin Qais Al-Ash`ari:The Prophet (ﷺ) said, ""A tent (in Paradise) is like a hollow pearl which is thirty miles in height and on every corner of the tent the believer will have a family that cannot be seen by the others."" (Narrated Abu `Imran in another narration, ""The tent is sixty miles in height)