1 Samuel 6:7

Now therefore make a new cart, and take two milch kine, on which there hath come no yoke, and tie the kine to the cart, and bring their calves home from them:

Ver. 7. Now therefore make a new cart.] For reverence to the ark, which the Philistines might cart: but if David, who should have known better, do so, as 2 Samuel 6:3, though it were a new cart, yet God made a breach upon him, because the ark was not carried as it ought, on the Levites' shoulders.

On which there hath come no yoke.] Untamed and untrained, iuvencae petulcae, and therefore less likely to do that piece of service they were now to be put to. But God was the more seen in it, confuting his enemies by their own inventions.

And bring their calves home from them.] This made the miracle the greater, and the hand of God the more manifest, since they naturally longed after their calves, and would break through all, to come to them.