Musannaf Ibn Abi Shayba 3:2620

Ghundar narrated to us, from Shu'bah, from Sa'd ibn Ibrahim, who said: I heard Muhammad ibn 'Abd al-Rahman ibn Thawban narrating from a man of the Ansar, from a man among the companions of the Prophet, may Allah bless him and grant him peace, from the Prophet, may Allah bless him and grant him peace, that he said: "Three things are a duty upon every Muslim: bathing on the day of Friday, the tooth-stick (siwak), and applying some perfume if he has any."