Abu Najih says that once someone asked Sayyiduna Ibn Umar (may Allah be pleased with them both) about fasting on the day of Arafah. He replied: I performed Hajj with the Prophet (peace and blessings be upon him), but he did not fast on that day. I performed Hajj with Sayyiduna Abu Bakr, Sayyiduna Umar (may Allah be pleased with them), and Sayyiduna Uthman (may Allah be pleased with him), but they also did not fast on that day. I neither fast on that day nor do I command it nor prohibit it.