Sayyiduna Harithah bin Wahb al-Khuza'i (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him) led the prayer at Mina with two rak'ahs, when the people were at their greatest number."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3228