Sahih Muslim 181a

‘Ubaydullah ibn ‘Umar ibn Muyassara narrated to us: ‘Abd al-Rahman ibn Mahdi narrated to me: Hammad ibn Salama narrated to us, from Thabit al-Bunani, from ‘Abd al-Rahman ibn Abi Layla, from Suhayb, from the Prophet (peace and blessings be upon him), who said: “When the people of Paradise enter Paradise,” he said, “Allah, Blessed and Exalted, will say: ‘Would you like Me to give you something more?’ They will say: ‘Have You not brightened our faces, admitted us to Paradise, and saved us from the Fire?’” He said: “Then He will unveil the veil, and they will be given nothing dearer to them than looking upon their Lord, Mighty and Majestic.”