Musannaf Ibn Abi Shayba 3:3165

Abu Bakr narrated to us, he said: 'Abdah bin 'Uthman bin Hakim narrated to us, from 'Uthman bin Abi Sulayman, from Abu Sa'id al-Khudri, he said: "Indeed, it is among the rights upon the Muslim, when it is the day of Friday, to use the siwak, and to wear from his best clothes, and to apply perfume if he has any."