Narrated by Ayesha (may Allah be pleased with her) ALLAH’s Messenger (peace be upon him) said:
“Ten things are part of the Fitrah (Not Allowed to keep more than the forty days):

1. Cutting the mustache
2. Letting the beard grow
3. Cleaning the teeth with a Siwaak
4. Rinsing the nose with water
5. Cutting one’s nails
6. Washing between the finger-joints
7. Plucking the armpit hairs
8. shaving the pubic hair and
9. Cleaning one’s private parts with water.”

Mus’ab said: I have forgotten the tenth but I think it was rinsing the mouth.

[ Reported by Ahmad, Muslim and the four authors of Sunan, from the hadeeth of ‘Aa’ishah, may Allah be pleased with her ]