1 Samuel 6:10-12

10And the men did so, and took two milk cows and hitched them to the cart, and corralled their calves at home.

11They put the ark of the Lord on the cart, and the box containing the golden mice and the replicas of their tumors.

12And the cows went straight toward Beth-shemesh along the highway, lowing as they went, and did not turn away to the right or the left. And the Philistine lords (governors) followed them to the border of Beth-shemesh.