The father of Musa bin Ali (may Allah have mercy on him) said: A man came to the Messenger of Allah (peace and blessings be upon him) and said: "I want to put a hobble on a horse", or he said: "I want to buy a horse." He (peace and blessings be upon him) said: "In this matter you must take a horse with white on its face, whose nose and upper lip are also white, and which is brown; or a horse that is black and white, whose right leg is entirely clear."