1 Samuel 6:7-9

7“Now build a new cart, and find two cows that have just given birth to calves. Make sure the cows have never been yoked to a cart. Hitch the cows to the cart, but shut their calves away from them in a pen.

8Put the Ark of the Lord on the cart, and beside it place a chest containing the gold rats and gold tumors you are sending as a guilt offering. Then let the cows go wherever they want.

9If they cross the border of our land and go to Beth-shemesh, we will know it was the Lord who brought this great disaster upon us. If they don’t, we will know it was not his hand that caused the plague. It came simply by chance.”