1 Samuel 6:8-11

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.” And the men did so, and took two milk cows and hitched them to the cart, and corralled their calves at home. They put the ark of the LORD on the cart, and the box containing the golden mice and the replicas of their tumors.