9:21 Those - He used them as bondmen, and imposed bodily labours upon them. But why did not Solomon destroy them as God had commanded, when now it was fully in his power to do so? The command of destroying them, Deut 7:2, did chiefly, if not only, concern that generation of Canaanites, who lived in, or, near the time of the Israelites entering into Canaan. And that command seems not to be absolute, but conditional, and with some exception for those who should submit and embrace the true religion, as may be gathered both from Josh 11:19, and from the history of the Gibeonites. For if God's command had been absolute, the oaths of Joshua, and of the princes, could not have obliged them, nor dispensed with such a command.
9:15-28 Here is a further account of Solomon's greatness. He began at the right end, for he built God's house first, and finished that before he began his own; then God blessed him, and he prospered in all his other buildings. Let piety begin, and profit follow; leave pleasure to the last. Whatever pains we take for the glory of God, and to profit others, we are likely to have the advantage. Canaan, the holy land, the glory of all lands, had no gold in it; which shows that the best produce is that which is for the present support of life, our own and others; such things did Canaan produce. Solomon got much by his merchandise, and yet has directed us to a better trade, within reach of the poorest. Wisdom is better than the merchandise of silver, and the gain thereof than fine gold, Pr 3:14.