Damdam bin Jaws narrates from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The coming out of the imam on Friday ends the prayer, and his sermon ends conversation."
This is a gross error. Abd al-Razzaq narrated it from Ma'mar, from Ibn Shihab al-Zuhri, from Sa'id bin al-Musayyib as his own saying, not attributed to the Prophet. Ibn Abi Dhi'b and Yunus narrated it from al-Zuhri from Tha'labah bin Abi Malik, and Malik narrated it from al-Zuhri and distinguished al-Zuhri's words from Tha'labah's, as we mentioned; and that is the mahfuz (preserved) version according to Muhammad bin Yahya al-Dhuhli.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5687