Now the weight of gold that came to Solomon in one year was six hundred threescore and six talents of gold,

Wesley's Notes

10:14 Six hundred, and c. - Which amounts to about three millions of our money. And this gold did not come from Ophir in India, or Tharshish; but from Arabia and Ethiopia, which then were replenished with gold, though exhausted by the insatiable avarice of succeeding Ages.

Jamieson-Fausset-Brown Bible Commentary

1Ki 10:14-29. His Riches.

14, 15. Now the weight of gold that came to Solomon in one year-666 talents, equal to £3,996,000. The sources whence this was derived are not mentioned; nor was it the full amount of his revenue; for this was "Beside that he had of the merchantmen, and of the traffic of the spice merchants, and of all the kings of Arabia, and of the governors of the country." The great encouragement he gave to commerce was the means of enriching his royal treasury. By the fortifications which he erected in various parts of his kingdom, (particularly at such places as Thapsacus, one of the passages of Euphrates, and at Tadmor, in the Syrian desert), he gave complete security to the caravan trade from the depredations of the Arab marauders; and it was reasonable that, in return for this protection, he should exact a certain toll or duty for the importation of foreign goods. A considerable revenue, too, would arise from the use of the store cities and khans he built; and it is not improbable that those cities were emporia, where the caravan merchants unloaded their bales of spices and other commodities and sold them to the king's factors, who, according to the modern practice in the East, retailed them in the Western markets at a profit. "The revenue derived from the tributary kings and from the governors of the country" must have consisted in the tribute which all inferior magistrates periodically bring to their sovereigns in the East, in the shape of presents of the produce of their respective provinces.

Matthew Henry's Concise Commentary

10:14-29 Solomon increased his wealth. Silver was nothing accounted of. Such is the nature of worldly wealth, plenty of it makes it the less valuable; much more should the enjoyment of spiritual riches lessen our esteem of all earthly possessions. If gold in abundance makes silver to be despised, shall not wisdom, and grace, and the foretastes of heaven, which are far better than gold, make gold to be lightly esteemed? See in Solomon's greatness the performance of God's promise, and let it encourage us to seek first the righteousness of God's kingdom. This was he, who, having tasted all earthly enjoyments, wrote a book, to show the vanity of all worldly things, the vexation of spirit that attends them, and the folly of setting our hearts upon them: and to recommend serious godliness, as that which will do unspeakably more to make us happy, that all the wealth and power he was master of; and, through the grace of God, it is within our reach.