Musnad Ahmad 30:695

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from Ibn al-Musayyib, from Abu Hurayrah, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Five are of the *fitrah* (natural disposition): shaving the pubic hair, circumcision, trimming the mustache, plucking the underarm hair, and clipping the nails."