Genesis 37:28

Then there passed by Midianites, merchantmen; and they drew and lifted up Joseph out of the pit, and sold Joseph to the Ishmaelites for twenty pieces of silver; and they brought Joseph into Egypt, passing within twenty miles of his father's home to do so. Twenty pieces, or shekels, of silver was the price of a slave-boy, as fixed in the laws of Moses, Leviticus 27:5, well over ten dollars in American money. So the sons of Jacob, as they thought, had their revenge, and Judah thought he had salved his conscience. Such is the progress of sin.