Sayyiduna Yazid bin Aswad (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) performed the prayer. When he completed the prayer, there were two men behind the people (who had not performed the prayer in congregation with the Prophet). By the order of the Prophet (peace and blessings be upon him), both of them were brought, and their bodies were trembling. The Prophet (peace and blessings be upon him) asked them: What is the reason that you both did not perform the prayer with us? Both of them replied: O Messenger of Allah! We had already performed the prayer at our place of residence, then we came here. The Prophet (peace and blessings be upon him) said: When you have performed the prayer at your place of residence and then you find the (congregational) prayer (with the Imam), then perform the prayer; it will be counted as a voluntary (nafl) prayer for you.