Musnad Ahmad 33:805

Affan narrated to us, Abd al-Wahid narrated to us, Sulayman ibn Mihran al-A'mash narrated to us, he said: I heard Abu Sufyan, he said: I heard Jabir ibn Abdullah saying: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Indeed, the people of Paradise eat therein and drink. They do not urinate, they do not defecate, they do not spit, and they do not blow their noses. Their food is [digested through] a belch and perspiration like the perspiration of musk."