Hazrat Iyad Ash'ari (may Allah be pleased with him) narrates that I was present at the Battle of Yarmouk. Hazrat Abu Ubaidah bin Jarrah (may Allah be pleased with him) said, "Who will race horses with me?" A young man said, "I am ready to race, if you will not be angry." The narrator says that the young man went ahead of him. I was watching the locks of Hazrat Abu Ubaidah (may Allah be pleased with him); they were disheveled and he was moving them aside while riding an Arabian horse behind that young man.