1 Samuel 6:7-8

7You must make a new cart. Find two cows that have just given birth to calves. It must be the first time that those cows have pulled a cart. Tie them to the cart with ropes so that they can pull it. Then take their calves away from them.

8Put the Lord's Covenant Box on the cart. Put another box on the cart with the gold images inside it. Those are your offerings to their God so that he will forgive you. Then send the cart away.