If fire break out: Mr. Harmer observes, that it is a common custom in the East to set the dry herbage on fire; which fires, from want of care, often produce great damage. Hence a law to guard against such evils was highly expedient.
so that the stacks of corn: Jdg 15:4-5; 2Sa 14:30-31
he that kindled the fire: Exo 22:9, Exo 22:12, Exo 21:33-34