Abu Musabbih Al-Awza'i (may Allah have mercy on him) says that once we were walking in a place called "Darb Qalamiyah" when our leader, Hazrat Malik bin Abdullah Khath'ami (may Allah be pleased with him), was called by a man who was driving his horse along the width of the mountain, "O Abu Abdullah! Why don't you ride?" He replied, "I heard the Noble Prophet (peace and blessings be upon him) say: 'The feet of a person that become dusty for even a moment in the path of Allah, both of them become forbidden for the fire of Hell.'"