1 Samuel 6:9-12

9and watch. If it goes up on the way to its own land, to Beth-shemesh, then it is he who has done us this great harm, but if not, then we shall know that it is not his hand that struck us; it happened to us by coincidence."

10The men did so, and took two milk cows and yoked them to the cart and shut up their calves at home.

11And they put the ark of the Lord on the cart and the box with the golden mice and the images of their tumors.

12And the cows went straight in the direction of Beth-shemesh along one highway, lowing as they went. They turned neither to the right nor to the left, and the lords of the Philistines went after them as far as the border of Beth-shemesh.