1 Kings 8:21

“ And there have I set a place for the ark, in which is the covenant of YHWH, which he made with our fathers, when he brought them out of the land of Egypt.”

He then sought to link the Temple with the deliverance from Egypt and the covenant made at Sinai. For he pointed out that the Ark which he had set in the Temple was the very Ark in which was the covenant of YHWH, the covenant that YHWH had made with His people when He had delivered them out of the land of Egypt (Exodus 20). Thus the Temple was now linked closely with the covenant, and had been built as a result of YHWH's words to David.

He no doubt hoped that that was the end of the matter. But as the future would reveal, many of the people were far from convinced. The Central Sanctuary in Jerusalem would not later have taken such a hold on Israel that it would prevent the split into two kingdoms. (It might have been somewhat different if it had still been established at Gibeon). Nor did it grip the hearts of all in Judah, even though the splitting of the two kingdoms would certainly have helped to focus the attention of many in Judah more on Jerusalem simply as a reaction to Israel's desertion.

(It should be noted that there is nowhere any suggestion here that this was a fulfilment of Deuteronomy 12, nor on the fact that Jerusalem was the place that YHWH had chosen. All the emphasis is on the fact that it was David who was chosen, and that that was the reason why the Temple was being built in his own city).