1 Samuel 6:4-9

Then they said, “What shall the guilt offering be which we shall return to Him?” They answered, “Five golden tumors and five golden mice, according to the number of the lords (governors) of the Philistines, for one plague was on all of you and on your lords. So you shall make replicas of your tumors and of your mice that ravage the land, and give glory to the God of Israel; perhaps He will lighten His hand [of judgment] on you and your gods and your land. Why then do you harden your hearts [allowing pride to cause your downfall] just as the Egyptians and Pharaoh hardened their hearts? When He had severely dealt with them and mocked them, did they not allow the people [of Israel] to go, and they departed? Now then, make a new cart and prepare two milk cows on which a yoke has never been placed; and hitch the cows to the cart and take their calves back home, away from them. Then take the ark of the LORD and put it on the cart; and put the articles of gold which you are returning to Him as a guilt offering in a box beside it. Then send it away [without a driver]. But watch, if it goes up by the way of its own territory to Beth-shemesh, then [you will know that] He has done us this great evil. But if not, then we will know that it was not His hand that struck us; this disaster happened to us by chance.”