Upon a new cart. — The new cart, one which had been used for no other purpose, was doubtless intended as a mark of respect (comp. 1 Samuel 6:7); yet it was a violation of the law (Numbers 7:9), requiring that the ark should be borne by the Levites. It is not necessary to suppose that David intended to violate the law; but the ark having been left neglected for more than two generations, the exact requirements in regard to it may easily have passed out of mind.
Abinadab that was in Gibeah. — Rather, in the hill, as the same word is translated in 1 Samuel 7:1. Abinadab himself may have been long since dead, and Uzzah and Ahio may have been either his sons, now advanced in life, or his grandsons.