Jabir bin Yazid narrates from his father: The Prophet Muhammad (peace be upon him) led the Fajr prayer in Mina. When he finished the prayer, he saw two men behind the people. He had both of them called, and they were brought, and they were trembling. He asked: "Why did you not pray with the people?" Both of them replied: "We had already performed the prayer at our place of residence." He said: "Do not do so. When a person has already performed the prayer at his place of residence and then finds the congregational prayer with the Imam, he should also perform that prayer with the Imam; it will be counted as a voluntary prayer for him."