6 And when they came to the threshing floor of Nacon, Uzzah put out his hand to the ark of God and took hold of it, for the oxen stumbled. 7 And the anger of the Lord was kindled against Uzzah; and God smote him there because he put forth his hand to the ark; and he died there beside the ark of God. 8 And David was angry because the Lord had broken forth upon Uzzah; and that place is called Pe'rez-uz'zah, to this day.
Matthew Henry's Commentary on 2 Samuel 6:6-8
Commentary on 2 Samuel 6:6-11
(Read 2 Samuel 6:6-11)
Uzzah was struck dead for touching the ark. God saw presumption and irreverence in Uzzah's heart. Familiarity, even with that which is most awful, is apt to breed contempt. If it were so great a crime for one to lay hold on the ark of the covenant who had no right to do so, what is it for those to lay claim to the privileges of the covenant that come not up to the terms of it? Obed-edom opened his doors without fear, knowing the ark was a savour of death unto death to those only who treated it wrong. The same hand that punished Uzzah's proud presumption, rewarded Obed-edom's humble boldness. Let none think the worse of the gospel for the judgments on those that reject it, but consider the blessings it brings to all who receive it. Let masters of families be encouraged to keep up religion in their families. It is good to live in a family that entertains the ark, for all about it will fare the better.