Jabir bin Yazid narrates from his father: I participated in the Hajj with the Prophet (peace be upon him). I performed the morning prayer behind him in the Mosque of Khaif. When he completed his prayer and finished, there were two men behind the people who had not prayed behind him. The Prophet (peace be upon him) ordered: "Bring them to me." They were brought, and both were trembling. The Prophet (peace be upon him) asked: "Why did you both not pray with us?" They replied: O Messenger of Allah! We had already performed the prayer at our residence. The Prophet (peace be upon him) said: "Do not do so. When you have performed the prayer at your residence, then come to the mosque where the congregation is being held and pray with the people as well. This will become a voluntary prayer for you."