Abd al-Rahman bin Yazid says: Sayyiduna Uthman bin Affan (may Allah be pleased with him) led four rak'ahs at Mina, and Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "I prayed two rak'ahs each at Mina with the Prophet (peace and blessings be upon him), Sayyiduna Abu Bakr and Sayyiduna Umar (may Allah be pleased with them both)." In this, Hafs added: (I prayed two) with Sayyiduna Uthman (may Allah be pleased with him) also at the beginning of his caliphate, then he completed the prayer. Here the narration adds from Abu Mu'awiyah: "Then your ways diverged; I wish that, in place of the four rak'ahs, my share were two accepted rak'ahs." Mu'awiyah bin Qurrah narrates from his elders that Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) prayed four rak'ahs, and it was said to him: You used to find fault with Sayyiduna Uthman (may Allah be pleased with him), and now you yourself pray four rak'ahs? He said: "Disagreement is an evil thing."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5434