Musnad Ahmad 788:197

'Ali ibn 'Abdullah narrated to us, 'Abd al-'Aziz ibn 'Abd al-Samad al-'Ammi narrated to us, Abu 'Imran al-Jawni narrated to us, from Abu Bakr ibn 'Abdullah ibn Qays, from his father, from the Messenger of Allah (may Allah bless him and grant him peace) that he said: "In Paradise, there is a tent made of a single hollowed pearl, the width of which is sixty miles. In every corner of it, there are people who do not see the others, and the believer goes around to them."