1 Samuel 6:9

And see, if it, the cart as thus prepared, goeth up by the way of his own coast to Beth-shemesh, within the territory of Israel, then He, the God of Israel, hath done us this great evil; but if not, then we shall know that it is not His hand that smote us; it was a chance that happened to us. The crafty priests of Dagon, who feared for their prestige, had purposely specified cows with calves, since it was probable that their instinct, their natural impulse, would tend to make them turn back to their stalls, unless a higher power restrained them, compelling them to take the road to Beth-shemesh and hold it.