1 Samuel 6:7-8

6:7 So now go and make a new cart. Get two cows that have calves and that have never had a yoke placed on them. Harness the cows to the cart and take their calves from them back to their stalls. 6:8 Then take the ark of the Lord and place it on the cart, and put in a chest beside it the gold objects you are sending to him as a guilt offering. You should then send it on its way.