Musnad Ahmad 1013:79

Qutaybah ibn Sa'id narrated to us, Ya'qub ibn 'Abd al-Rahman narrated to us, from Abu Hazim, from Sahl ibn Sa'd, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the people of Paradise will see the chamber in Paradise just as you see the star in the sky." He said: So I narrated that to al-Nu'man ibn Abi 'Ayyash, and he said: I heard Abu Sa'id al-Khudri saying: "Just as you see the brilliant star in the eastern or western horizon."