Mustadrak al-Hakim — Hadith 811

Jabir bin Yazid bin al-Aswad narrates from his father (Sayyiduna Yazid bin al-Aswad, may Allah be pleased with him): I prayed with the Messenger of Allah (peace and blessings be upon him) at Mina. When he (peace and blessings be upon him) finished with the salam, he saw two men at the back of the people. He (peace and blessings be upon him) had them called and asked: "What prevented you from praying with the people?" They said: "O Messenger of Allah! We had already prayed in our camps (tents)." He (peace and blessings be upon him) said: "Do not do that. When one of you has prayed in his camp and then finds the prayer (being held) with the imam, let him pray it with him as well; it will be a voluntary (nafl) prayer for him."
This hadith is narrated from Ya'la bin Ata', and Imam Muslim used him as evidence. A large group, including Shu'bah and Hisham bin Hassan, narrated it.