Musnad Abu Ya'la al-Mawsili 149:12

Shayban narrated to us, Abu al-Rabi' al-Samman narrated to us, Hisham ibn 'Urwah narrated to us, from his father, from 'Aishah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The growth of hair in the nose is a protection against leprosy."