1 Chronicles 13:9

9When they came to the threshing floor of Chidon, Uzza put out his hand to hold and steady the ark, for the oxen [that were drawing the cart] 13:9 Exactly what happened is unclear. However, the oxen might have begun to run toward the threshing floor, lured by the smell of grain left over from threshing. The fact that oxen threshing grain (trampling the stalks to separate the kernels) would naturally eat some of the grain accounts for the prohibition against muzzling the ox during threshing (Deut 25:4; cf 1 Tim 5:18). But in any case, Uzza violated the great sanctity of the ark by touching it. God could have intervened and prevented the ark from being dislodged, if He so desired.nearly overturned it.