The theme verse of 1 & 2 Kings are combined for two reasons: first, the two documents were originally written as one book, but were simply divided up because of scroll length. This is true also of 1 & 2 Chronicles and 1 & 2 Samuel, but in this case, the theme of both 1 & 2 Kings was best summed up together (in the other book pairs, each book had a more distinctive theme).
David built houses for himself in the city of David. And he prepared a place for the ark of God and pitched a tent for it. Then David said that no one but the Levites may carry the ark of God, for the Lord had chosen them to carry the ark of the Lord and to minister to him forever. And David assembled all Israel at Jerusalem to bring up the ark of the Lord to its place, which he had prepared for it. And David gathered together the sons of Aaron and the Levites: of the sons of Kohath, Uriel the chief, with 120 of his brothers; ... Scripture Image