1 Samuel 6:4-6
4-6"And what exactly would make for adequate compensation?"
"Five gold tumors and five gold rats," they said, "to match the number of Philistine leaders. Since all of you—leaders and people—suffered the same plague, make replicas of the tumors and rats that are devastating the country and present them as an offering to the glory of the God of Israel. Then maybe he'll ease up and not be so hard on you and your gods, and on your country. Why be stubborn like the Egyptians and Pharaoh? God didn't quit pounding on them until they let the people go. Only then did he let up.
7-9"So here's what you do: Take a brand-new oxcart and two cows that have never been in harness. Hitch the cows to the oxcart and send their calves back to the barn. Put the Chest of God on the cart. Secure the gold replicas of the tumors and rats that you are offering as compensation in a sack and set them next to the Chest. Then send it off. But keep your eyes on it. If it heads straight back home to where it came from, toward Beth Shemesh, it is clear that this catastrophe is a divine judgment, but if not, we'll know that God had nothing to do with it—it was just an accident."