Musnad Ahmad 33:197

Sufyan narrated to us, from ‘Amr, who heard Jabir: A man entered on the day of Friday while the Prophet, may Allah bless him and grant him peace, was delivering the sermon. The Prophet, may Allah bless him and grant him peace, said to him, "Have you prayed?" He said, "No." He said, "Pray two rak'ahs."