Ibn al-Sabbaq says that the Prophet (peace and blessings be upon him) said: "O assembly of Muslims! Allah has made this day (Friday) an Eid for the Muslims, so take a bath; whoever has perfume should apply it; and hold fast to the siwak."
The correct version is this mursal one; it has also been narrated with a connected chain, but its connection is not authentic.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5959