Matthew Henry on 1 Kings 9:15–end
We have here a further account of Solomon's greatness.
I. His buildings. He raised a great levy both of men and money, because he projected a great deal of building, which would both employ many hands and put him to a vast expense, Kg1 9:15. And he was a wise builder, who sat down first, and counted the cost, and would not begin to build till he found himself able to finish. Perhaps there was some complaint of the heaviness of the taxes, which the historian excuses from the greatness of his undertakings. He raised it, not for war (as other princes), which would spend the blood of his subjects, but for building, which would require only their labour and purses. Perhaps David observed Solomon'…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Kings 9:18
Baalath--Baal-bek.
Tadmor--Palmyra, between Damascus and the Euphrates, was rebuilt and fortified as a security against invasion from northern Asia. In accomplishing these and various other works which were carried on throughout the kingdom, especially in the north, where Rezon of Damascus, his enemy, might prove dangerous, he employed vast numbers of the Canaanites as galley slaves (Ch2 2:18), treating them as prisoners of war, who were compelled to do the drudgery and hard labor, while the Israelites were only engaged in honorable employment.
Adam Clarke on 1 Kings 9:19
And all the cities of store - Though, by the multitude and splendor of his buildings, Solomon must have added greatly to the magnificence of his reign; yet, however plenteous silver and gold were in his times, his subjects must have been greatly oppressed with the taxation necessary to defray such a vast public expenditure.
John Gill on 1 Kings 9:20
And all the people that were left of the Amorites, Hittites, Perizzites, Hivites, and Jebusites,.... Who were not destroyed in the times of Joshua, or since, but dwelt in several cities of the land of Israel from those times; see Judges 1:1, which were not of the children of Israel; not natives of the land of Israel, though they might be proselytes, at least some of them.