9:21 Unto all the congregation - That is, Let them be public servants, and employed in the meanest offices, (one kind being put for all the rest) for the use of the congregation; to do this partly for the sacrifices and services of the house of God, which otherwise the Israelites themselves must have done; partly for the service of the camp or body of the people; and sometimes, even to particular Israelites.
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.
