Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: Ten things are part of natural disposition (fitrah): trimming the moustache, letting the beard grow, using the miswak, cleaning the nose with water, cutting the nails, washing the joints of the fingers, plucking the hair from the armpits, shaving the pubic hair, and cleaning oneself with water after relieving oneself. The narrator, Hazrat Mus'ab, says: I forgot the tenth characteristic, and most likely it is rinsing the mouth.