Musannaf Ibn Abi Shayba 28:32

'Abd al-Rahim ibn Sulayman narrated to us, from 'Abd Allah ibn Muslim, from Ibn Sabit, from 'Abd Allah ibn 'Amr, who said: "In Paradise, there is a palace called 'Adn, around which are meadows and ascents. It has five thousand doors. None shall dwell in it, or enter it, except a prophet, or a truthful person (siddiq), or a martyr, or a just leader."