Mukhariq (may Allah have mercy on him) says that on the day of the Battle of Jamal, I met Hazrat Ammar (may Allah be pleased with him) while he was urinating in a horn. I asked him, "Can I fight in your company so that I may attain your companionship?" He replied, "Fight under the flag of your own people, because the Noble Prophet (peace and blessings be upon him) liked that a person should fight under the flag of his own people."