9:14-21 The Israelites, having examined the provisions of the Gibeonites, hastily concluded that they confirmed their account. We make more haste than good speed, when we stay not to take God with us, and do not consult him by the word and prayer. The fraud was soon found out. A lying tongue is but for a moment. Had the oath been in itself unlawful, it would not have been binding; for no obligation can render it our duty to commit a sin. But it was not unlawful to spare the Canaanites who submitted, and left idolatry, desiring only that their lives might be spared. A citizen of Zion swears to his own hurt, and changes not, Ps 15:4. Joshua and the princes, when they found that they had been deceived, did not apply to Eleazar the high priest to be freed from their engagement, much less did they pretend that no faith is to be kept with those to whom they had sworn. Let this convince us how we ought to keep our promises, and make good our bargains; and what conscience we ought to make of our words.

18-27. the children of Israel smote them not—The moral character of the Gibeonites' stratagem was bad. The princes of the congregation did not vindicate either the expediency or the lawfulness of the connection they had formed; but they felt the solemn obligations of their oath; and, although the popular clamor was loud against them, caused either by disappointment at losing the spoils of Gibeon, or by displeasure at the apparent breach of the divine commandment, they determined to adhere to their pledge, "because they had sworn by the Lord God of Israel." The Israelitish princes acted conscientiously; they felt themselves bound by their solemn promise; but to prevent the disastrous consequences of their imprudent haste, they resolved to degrade the Gibeonites to a servile condition as a means of preventing their people from being ensnared into idolatry, and thus acted up, as they thought, to the true spirit and end of the law.