Musnad Ahmad 33:1000

Rawh narrated to us, Ibn Jurayj narrated to us, Abu al-Zubayr informed me that he heard Jabir ibn Abdullah saying: I heard the Prophet, peace and blessings of Allah be upon him, saying: "The people of Paradise will eat therein and drink, and they will not blow their noses, nor will they defecate, nor will they urinate. Their food will be like a belch, and they will be inspired to glorify and praise [Allah] just as they are inspired to breathe."