Abd al-Rahman bin Humayd (may Allah have mercy on him) narrates from his father that Sayyiduna Uthman bin Affan (may Allah be pleased with him) prayed the prayer in full at Mina, then addressed the people and said: O people, the Sunnah is indeed the way of the Messenger of Allah (peace and blessings be upon him) and his two companions; but now many people have come, and I feared that they would take it as the Sunnah.
The Shaykh says: There is a concession in this, and he also considered praying in full to be permissible, as was the view of Sayyidah Aishah (may Allah be pleased with her).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5438