It was narrated that Salamah bin Qais said to me: 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.'
It was narrated from 'Asim bin Laqit bin Sabrah that his father said: I said: 'O Messenger of Allah! Tell me about ablution.' He said: 'Perform ablution properly and sniff water up into your nostrils, thoroughly, unless you are fasting.'
It was narrated that Ibn 'Abbas said: 'Sniff up water into the nostrils thoroughly, two or three times.'
It was narrated that Abu Hurairah said: The Messenger of Allah said: 'Whoever performs ablution, let him clean his nose, and whoever uses pebbles to clean himself after defecating, let him use an odd number.'