1 Samuel 6:7-9

7Now therefore get a new cart ready, two milk cows on which there has never been a yoke, hitch the cows to the cart, and return their calves home, away from them.

8Then take the ark of Adonai and place it on the cart; also put the golden objects that you return to Him as a guilt offering in a box by its side. Then send it off so it may go.

9Then watch—if it goes up by the way of its own territory to Beth-shemesh, then it was He who inflicted on us this great harm. But if not, then we will know that it was not His hand that struck us; it just happened to us by chance.”