Uzzah put forth his hand - In Numbers 4:15-20, the Levites are forbidden to touch the ark on pain of death, this penalty was inflicted upon Uzzah, and he was the first that suffered for a breach of this law.

Nachon's

1 Chronicles 13:9 And when they came to the threshing floor of Chidon, Uzza put forth his hand to hold the ark; for the oxen stumbled.

he is called Chidon
put forth Even the Kohathites, who were appointed to carry the ark, it was covered by the priests, were forbidden to {touch} it on {pain of death}; but uzzah, who certainly was no priest, probably with some degree of irreverence, having presumed to lay his hand upon the ark, which perhaps was not covered, thus incurred the penalty due to his rashness.

Numbers 4:15,19,20 And when Aaron and his sons have made an end of covering the sanctuary, and all the vessels of the sanctuary...

shook it. or, stumbled

Excursus on the Present Teaching of the Latin and Greek Churches on the Subject.
To set forth the present teaching of the Latin Church upon the subject of images and the cultus which is due them, I cite the decree of the Council of Trent and a passage from the Catechism set forth by the authority of the same synod. (Conc. Trid., Sess. xxv. December 3d and 4th, 1563. [Buckley's Trans.]) The holy synod enjoins on all bishops, and others sustaining the office and charge of teaching that, according to the usage of the Catholic and Apostolic Church received from the primitive times …
Philip Schaff—The Seven Ecumenical Councils