Thou hast sold thy people, and not become rich. In saying that they were sold without any gain, it is meant that they were exposed to sale as slaves that are contemptible, and of no value. In the second clause, too, And hast not increased the price of them, there seems to be an allusion to the custom of exposing things to auction, and selling them to the highest bidder. We know that those slaves who were sold were not delivered to the buyers till the price of them had been increased by bidding. Thus the faithful mean, that they were cast out as being altogether worthless, so that their condition had been worse than that of any bond-slave. [1] And as they rather appeal to God than turn to their enemies, of whose pride and cruelty they had just cause to complain, let us learn from this, that there is nothing better, or more advantageous for us in our adversity, than to give ourselves to meditation upon the providence and judgment of God. When men trouble us, it is no doubt the devil who drives them to it, and it is with him we have to do; but we must, notwithstanding, raise our thoughts to God himself, that we may know that we are proved and tried by him, either to chastise us, or to exercise our patience, or to subdue the sinful desires of our flesh, or to humble us and train us to the practice of self-denial. And when we hear that the Fathers who lived under the Law were treated so ignominiously, there is no reason why we should lose courage by any outrage or ill treatment, if God should at any time see meet to subject us to it. It is not here said simply that God sold some people, but that he sold his own people, as if his own inheritance were of no estimation in his sight. Even at this day, we may in our prayers still make the same complaint, provided we, at the same time, make use of this example, for the purpose of supporting and establishing our faith, so that, however much afflicted we may be, our hearts may not fail us. In Isaiah 52:3, God, using the same form of speech, says that he sold his people without price; but there it is to be understood in a different sense, namely, to show that he will have no difficulty in redeeming them, because he is under no obligation to those that bought them, and had received nothing from them in return.

Footnotes

1 - As if they had said, Thou hast sold us to our enemies at whatever price they would give; like a person who sells things that are useless at any price, not so much for the sake of gain, as to get quit of what he considers of no value and burdensome.

Thou sellest thy people for nought - Margin, without riches. Without gain, or advantage; that is, for no price that would be an equivalent. The people were given up to their enemies, but there was nothing in return that would be of equal value. The loss was in no way made up. They were taken away from their country and their homes. They were withdrawn from useful labor in the land; there was a great diminution of the national strength and of the national wealth; but there was no return to the land, no advantage, no valuable result, that would be an equivalent for thus withdrawing them from their country and their homes. It was as though they had been given away. A case may be supposed where the exile of a part of a people might be an advantage to a land, or where there would be a full equivalent for the loss sustained, as when soldiers go forth to defend their country, and to repel a foe, rendering a higher service than they could by remaining at home; or as when colonists go forth and settle in a new region, producing valuable returns in commerce; or as when missionaries go forth among the pagan, often producing, by a reflex influence, effects on the piety and prosperity of the churches at home, more important, and more widely diffused, than would have been produced by their remaining to labor in their own country.
But no such valuable results occurred here. The idea is that they were lost to their homes; to their country; to the cause of religion. It is not necessary to suppose that the psalmist here means to say that the people had been literally sold into slavery, although it is not in itself improbable that this had occurred. All that the words necessarily imply would be that the effect was as if they were sold into bondage. In Deuteronomy 32:30; Judges 2:14; Judges 3:8; Judges 4:2, Judges 4:9; Judges 10:7, the word used here is employed to express the fact that God delivered his people into the hand of their enemies. Any removal into the territories of the pagan would be a fact corresponding with all that is conveyed by the language used. There call be little doubt, however, that (at the time referred to) those who were made captives in war were literally sold as slaves. This was a common custom. Compare the notes at Isaiah 52:3.
And dost not increase thy wealth by their price - The words "thy wealth" are supplied by the translators; but the idea of the psalmist is undoubtedly expressed with accuracy. The meaning is, that no good result to the cause of religion, no corresponding returns had been the consequence of thus giving up the people into the hand of their enemies. This may however, be rendered, as DeWette translates it, "thou hast not enhanced their price;" that is, God had not set a high price on them, but had sold them for too little, or had given them away for nothing. But the former idea seems better to suit the connection and to convey more exactly the meaning of the original. So it is rendered in the Chaldee, and by Luther.

Thou sellest thy people for nought - An allusion to the mode of disposing of slaves by their proprietors or sovereigns. Instead of seeking profit, thou hast made us a present to our enemies.

Thou sellest thy people (l) for nought, and dost not increase [thy wealth] by their price.
(l) As slaves who are sold for a low price, you do not look for him who offers the most, but take the first offer.

Thou sellest thy people for nought,.... So God, when he is said to deliver up his people into the hands of their enemies, is said to sell them to them; see Judges 2:14; and selling them for nought suggests, that in their apprehensions he had no esteem of them and value for them; just as men, when they have any person or thing to dispose of they have no regard unto, but choose to be rid of, will part with it for nothing: and as it follows,
and dost not increase thy wealth by their price; get nothing by the bargain. This must be understood after the manner of men, and in the opinion of the church, and not as in reality; no otherwise than as it has been true, that God has suffered some of his people to be in the bondage and slavery of mystical Babylon, called Egypt, one part of whose wares and merchandises are slaves and souls of men, Revelation 11:8.