It is narrated from Sayyiduna Mihjan that once I was present in the service of the Prophet (peace and blessings be upon him), the prayer was established, so I sat to one side. When the prayer was finished, 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: "Then why did you not pray with the people?" I replied: "I had already prayed at home." The Prophet (peace and blessings be upon him) said: "Even if you have prayed at home, still join the people in prayer."