Sayyiduna Mihjan (may Allah be pleased with him) says: I came to the Noble Prophet (peace and blessings be upon him), and in the meantime, the iqamah for prayer was called, but I remained seated (and did not pray). The Prophet (peace and blessings be upon him) said to me: Are you not a Muslim? I replied: Why not! The Prophet (peace and blessings be upon him) said: What kept you from praying with the people? I said: O Messenger of Allah, I had already performed the prayer at home. The Prophet (peace and blessings be upon him) said: (Still) perform the prayer with the people. And in another narration: When you come, perform the prayer with the people, even if you have already performed the prayer at home.