Having now conquered Jerusalem, in 2 Samuel 6:1–23, David attempts to move the the Ark of God to Jerusalem. He had wanted to bring the ark of the covenant to Jerusalem from the house of Abinadab, its home base after its capture by the Philistines (1 Samuel 7:1–2). With the ark in Jerusalem, the religious and political life of the nation could be unified around David.
The ark symbolized the presence of God. It was a very sacred and holy thing.
Because of its sacred and holy power, associated with the presence of God, the Israelites were instructed that only the Levites should carry it and that it was not to be touched (Exodus 25:12–15; Numbers 4:15; 7:9; Deuteronomy 10:8).
The sons of Abinadab, Uzzah and Ahio, set the ark on a new cart, as the Philistines had done (1 Samuel 6:7), and guided it. Uzzah steadied the ark with his hand when it shifted on the cart. God struck him dead at the site of the ark because he showed disrespect for the holy things of God (1 Chronicles 15:13).