Musnad Abu Ya'la al-Mawsili 108:203

'Amr narrated to us, Sufyan narrated to us, from Abu al-Zubayr, from Jabir, who said: Sulayk al-Ghatafani entered the mosque while the Prophet, peace and blessings of Allah be upon him, was delivering the sermon on Friday. He said, "Have you prayed?" He said, "No." He said, "Then pray two rak'ahs."