John Gill Commentary 1 Kings 8:13

"I have surely built thee a house of habitation, a place for thee to dwell in for ever." — 1 Kings 8:13 (ASV)

I have surely built you an house to dwell in
Turning himself from the priests and people, he quieted with a few words, he addressed the Lord; having built an house for him, for his worship and glory, with this view, that he might dwell in it, he was now, by the above token, fully assured it would be an habitation for him:

a settled place for you to abide in for ever ;
which is observed in distinction from the tabernacle of Moses, which was often removed from place to place, otherwise this did not continue for ever; though Solomon might hope it would, at least to the times of the Messiah; and indeed such a building on this spot, for such use, did continue so long, excepting the interval of the seventy years' captivity in Babylon.