Musnad Ahmad 33:286

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The people of Paradise will eat therein and drink, and they will not defecate, nor will they urinate, nor will they blow their noses, nor will they spit. Their food will be [digested into] a belch and perspiration like the scent of musk."