Sahih Muslim Book 40, Hadith Number 6800.

Chapter : The description of Paradise and the remembrance of Allah by the inmates morning and evening.

Jabir b. Abdullah reported that Allah’s Messenger (may peace be upon him) said that the inmates of Paradise would eat therein and they would also drink, but they would neither void excrement, nor suffer catarrh, nor pass water, and their eating (would be digested) in the form of belching and their sweat would be musk aged they would glorify and praise Allah as easily as you breathe.