It is narrated from Hazrat Urwah bin Zubair (may Allah have mercy on him) that Sayyiduna Abu Hurairah (may Allah be pleased with him) saw two men together, so he asked one of them: "What is your relation to this other person?" He replied: "He is my father." Sayyiduna Abu Hurairah (may Allah be pleased with him) said: "Do not call him by his name, do not walk ahead of him, and do not sit (in a gathering) before he sits."