Musnad Ahmad 696:6

'Abd al-Rahman ibn Mahdi narrated to us, Hammad ibn Salamah narrated to us, from Thabit, from 'Abd al-Rahman ibn Abi Layla, from Suhayb, from the Prophet, peace and blessings of Allah be upon him, who said: "When the people of Paradise enter Paradise, and the people of the Fire enter the Fire, it will be called out: 'O people of Paradise, you have a promise from Allah.' They will say: 'Has He not made our scales heavy, given us our records in our right hands, admitted us into Paradise, and saved us from the Fire?'" He said: "Then the veil will be lifted." He said: "And Allah, the Mighty and Majestic, will manifest Himself to them." He said: "And Allah will not have given them anything more beloved to them than looking at Him."