(Ibid. 18) "And let there adhere to your hand naught from the spoil": From here they ruled: If he took from it (the spoil) a stick or a fork, or a shuttle, or a staff, he may not benefit from any of them. What shall he do with them? He shall take them to the Sea of Salt. In sum: All who would benefit from idolatry — let him take that "benefit" to the Sea of Salt!
"so that the L-rd turn from the fierceness of His wrath": So long as there is idolatry in the world, there is fierce wrath in the world. When idolatry departs, the wrath departs.