Musannaf Ibn Abi Shayba 3:2639

Zayd ibn al-Hubab narrated to us, he said: Malik ibn Anas informed me, from al-Zuhri, he said: Ibn Sabbaq informed me that the Messenger of Allah (may Allah bless him and grant him peace) said on a Friday among the Fridays: "Indeed, this is a day of Eid (festival), so perform ghusl (ritual bath). And whoever has perfume, it will not harm him to apply some of it. And upon you is the siwak (tooth stick)."