Sunan An-Nasa'i

It was narrated from 'Asim bin Laqit bin Sabirah that his father said:""I said: 'O Messenger of Allah, tell me about Wudu."" He said: 'Perform Wudu' well,[1] and exxagerate in sniffing water up into your nose, except when you are fasting.'"" [1]See No