Musannaf Ibn Abi Shayba 1:2046

Waki’ narrated to us, from Zakariya, from Mus’ab ibn Shaybah, from Talq, from Ibn al-Zubayr, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Ten are from the natural disposition (fitra): trimming the mustache, letting the beard grow, using the tooth stick (siwak), inhaling water into the nose, clipping the nails, washing the knuckles, plucking the armpit hair, shaving the pubic hair, and cleaning with water." Mus’ab said: "And I forgot the tenth, unless it is rinsing the mouth."