Hazrat Umar bin Ata bin Abu al-Khawar narrates that Nafi’ bin Jubair sent me to Hazrat Sa’ib bin Yazid to ask him about the matter which Sayyiduna Muawiyah (may Allah be pleased with him) had seen from him. He replied that I performed the Friday prayer with Sayyiduna Muawiyah (may Allah be pleased with him) in the mihrab. Then I stood at my place to offer voluntary (nafl) prayer. So he said to me,“Do not join a voluntary prayer with the Friday prayer until you move from that place or speak to someone, because the Messenger of Allah (peace and blessings be upon him) has commanded this.”