Musannaf Ibn Abi Shayba 30:25

'Isa ibn Yunus narrated to us, from Thawr, from Khalid ibn Ma'dan, from 'Abdullah ibn 'Umar, who said: "Paradise is folded and suspended by the horns of the sun; it is spread out once every year. And the souls of the believers are in the bellies of green birds like starlings; they recognize one another and are provided for from the fruits of Paradise."