Sunan Ibn Majah Book 1, Hadith 139
"The Messenger of Allah came to us and asked us for water for ablution. I brought water to him and he rinsed his mouth and sniffed water up into his nostrils from one handful."
The Messenger of Allah performed ablution and he rinsed his mouth three times, and sniffed water up into his nose three times from one handful.
The Messenger of Allah said to me: 'When you perform ablution, clean your nose, and when you use pebbles to clean yourself after defecating, use an odd number.'"