Charles H. Spurgeon on Psalms 18:42

"I did cast them out as the dirt in the streets," or rather "of the streets." In the East, all household refuse and filth is cast forth into the streets, where all of it that is at all edible is soon cleared away by birds and dogs, and all that is not is speedily dried up by the sun. To cast forth any one, therefore, as the dirt of the streets, is a strong image of contempt and rejection. —John Kitto.