Abu Salamah narrates from both Abu Hurayrah and Abu Sa'id (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "On Friday let him take a bath, use the tooth-stick (miswak), put on good clothes and apply perfume if he has any. Then let him not step over people's necks. Then let him pray as much as Allah wills, and when the imam comes out let him fall silent. This is an expiation until the next Friday."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5683