Musnad Abi Ya'la 5377 — he was with Sayyiduna Abdullah at Mina. When

It is narrated from al-Aswad (may Allah have mercy on him) that he was with Sayyiduna Abdullah (may Allah be pleased with him) at Mina. When Sayyiduna Uthman (may Allah be pleased with him) led four rak'ahs there, Sayyiduna Abdullah (may Allah be pleased with him), on finishing his prayer, said: "I prayed two rak'ahs at this very place with the Messenger of Allah (peace and blessings be upon him), Sayyiduna Abu Bakr (may Allah be pleased with him) also prayed two rak'ahs, and Sayyiduna Umar (may Allah be pleased with him) also prayed two rak'ahs." The narrator said: I think he also mentioned that Sayyiduna Uthman (may Allah be pleased with him) too used to pray only two rak'ahs (at first); then he said: "Today he prayed four rak'ahs." Al-Aswad (may Allah have mercy on him) said: I said to him: "O Abu Abd al-Rahman, did you not give the salam after the first two rak'ahs, so that you could pray the latter two rak'ahs as voluntary prayer?" He replied: "Disagreement is an evil."