Mu'awiyah bin Qurrah narrates from the elders of his tribe that Sayyiduna Uthman (may Allah be pleased with him) led a four-rak'ah prayer at Mina. When Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) came to know of this, he found fault with him. Then he himself led the Asr prayer as four rak'ahs at his lodging. I said: You find fault with Sayyiduna Uthman (may Allah be pleased with him) and yet you pray four rak'ahs yourself? He said: I dislike disagreement.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5435