It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he performed two rak'ahs of 'Isha prayer at Mina with the Noble Prophet (peace and blessings of Allah be upon him), and also performed two rak'ahs with Sayyiduna Abu Bakr (may Allah be pleased with him) and Sayyiduna Umar (may Allah be pleased with him), and during the early days of the caliphate of Sayyiduna Uthman (may Allah be pleased with him), he also performed two rak'ahs with him. Later, Sayyiduna Uthman (may Allah be pleased with him) started performing the prayer in full.