John Gill Commentary 1 Kings 9

And it came to pass, when Solomon had finished the building
of the house of the Lord
Which was done in seven years, (1 Kings 6:38) .

and the king's house ;
his own palace, which was finished in thirteen years, (1 Kings 7:1) ,

and all Solomon's desire which he was pleased to do ;
all his other buildings, the house for Pharaoh's daughter, the house of the forest of Lebanon, and may include his vineyards, gardens, orchards, and pools of water, made for his pleasure, (Ecclesiastes 2:4–6) in which he succeeded and prospered, (2 Chronicles 7:11) .

That the Lord appeared to Solomon the second time
Junius and Tremellius read this verse with the following, to the end of the ninth, in a parenthesis, and render this clause, "for the Lord had appeared" and Piscator translates it, "moreover the Lord appeared" as beginning a distinct narrative from the former; and indeed if the words are to be connected with the preceding, as in our version, this appearance must be thirteen years after the building of the temple, which is not probable; but rather it was the night after the dedication of it, when an answer was returned to Solomon's prayer in the preceding chapter; for that it should be deferred twelve or thirteen years is not reasonable to suppose; and this appearance was the second of the kind and manner:

as he had appeared unto him at Gibeon ;
in a dream and a vision, and by night, (1 Kings 3:5) , see (2 Chronicles 7:12) .

And the Lord said to him, I have heard your prayer and your
supplication that you have made before me
With delight and pleasure, and had accepted it; meaning the prayer recorded in the preceding chapter:

I have hallowed this house which you have built ;
by the cloud of glory filling it, and by fire descending from heaven, and consuming the sacrifices offered init, (2 Chronicles 7:1)

to put my name there for ever ;
there to grant his presence, so long as his pure worship continued in it; so the Targumadds, "and my Shechinah or divine Majesty shall abide in it, if my will is done there continually:"

and my eyes and my heart shall be there perpetually ;
his eyes of Providence should be upon it, to watch over it, and protect it, and its worshippers; and heshould have a cordial regard to the sacrifices there offered, and to the persons of the offerers, so long asthey offered them in a right way, and to right ends and purposes.

And if you will walk before me, as David your father walked, in
integrity of heart, and in uprightness.
&c.] Who, though guilty of many sins and failings in life, yet was sincere and upright in the worship of God, never apostatized from it, or fell into idolatry, which is what is chiefly respected:

to do according to all that I have commanded you, and will keep my
statutes and my judgments ;
observe all the laws of God, moral, ceremonial, and judicial.

Then I will establish the throne of your kingdom upon Israel for
ever
In a succession in his posterity, until the coming of the Messiah:

as I promised unto David your father, saying, there shall not fail you
a man upon the throne of Israel ;
not fail one of his posterity to sit upon it; see (2 Samuel 7:12 2 Samuel 7:13) (Psalms 132:11Psalms 132:12) .