From Sahih Bukhari (Hadith 3254):
Narrated Abu Huraira:The Prophet (ﷺ) said, "The first batch (of people) who will enter Paradise will be (glittering) like the full moon, and the batch next to them will be (glittering) like the most brilliant star in the sky. Their hearts will be as if the heart of a single man, for they will have neither enmity nor jealousy amongst themselves; everyone will have two wives from the houris, (who will be so beautiful, pure and transparent that) the marrow of the bones of their legs will be seen through the bones and the flesh
Reference: Bukhari 3254