And the men took of their victuals, etc. Some commentators here have recourse to the insipid fictions that they ate the bread, to ascertain from the taste whether it were stale from age, or that they confirmed the covenant by a feast. The words rather, in my opinion, are an indirect censure of their excessive credulity in having, on slight grounds acquiesced in a fabulous narrative, and in having attended merely to the bread, without considering that the fiction was devoid of color. And, certainly, had not their senses been blunted, many things would have instantly occurred to refute the Gibeonites. [1] But as it sometimes happens, that the most piercing eyes are dazzled by an empty spectacle, they are more severely condemned for not having ascertained the pleasure of God. The remedy was at hand, had they attempted nothing without consulting the oracle. It was a matter deserving of careful inquiry, and it was therefore a sign of gross carelessness, when a priest was ready to seek an answer from God, by means of Urim and Thummim, to decide rashly in an obscure case, as if they had no means of obtaining advice. Their rashness was the less excusable, from being combined with such supine neglect of the grace of God.

Footnotes

1 - Nothing could be more gross than the imposition thus practiced. The capital of the Gibeonites was not above fourteen miles west from Jericho, and scarcely half that distance south-west from Ai, where the Israelites had recently gained so signal a victory, and it is therefore not improbable that the Israelites, while pursuing the fugitives, had actually been within the territory which their leaders now ignorantly believe to be so very distant, as to be altogether beyond the limits of the promised land. The compliments paid to their prowess so flattered their pride, and the alliance of a powerful though distant nation held out the hope of so many advantages in the further prosecution of their conquests, that they fell at once into the snare, as if they had almost been willing to be deceived. -- Ed.

The elders of Israel Joshua 9:18, tasting what was offered them by the Gibeonites, pledged themselves according to the usage of Eastern nations to peace and friendship with them. They credited the story at once, instead of seeking the direction of God in the matter. The rendering of the margin is not to be preferred to that of the text.
At the mouth of the Lord - i. e. by the Urim and Thummim Exodus 28:30.

The men took of their victuals - This was done in all probability in the way of friendship; for, from time immemorial to the present day, eating together, in the Asiatic countries, is considered a token of unalterable friendship; and those who eat even salt together, feel themselves bound thereby in a perpetual covenant. But the marginal reading of this clause should not be hastily rejected.
And asked not counsel at the mouth of the Lord - They made the covenant with the Gibeonites without consulting God by Urim and Thummim, which was highly reprehensible in them, as it was a state transaction in which the interests and honor of God their king were intimately concerned.

And the (g) men took of their victuals, and asked not [counsel] at the mouth of the LORD.
(g) Some think that the Israelites are of their victuals, and so made a league with them.

And the men took of their victuals,.... That is, the princes of Israel took thereof; not to eat of them, for it cannot be thought that such personages would eat of such dry and mouldy bread, and especially as they were now in a plentiful country, and possessed of the fruits of it; but to see whether it was in such a plight and condition as they said, whereby they might judge of the truth of what they said; and they learned and knew, as R. Jonah observes, from the dryness of their food, that it was truth they said; and so the Targum, the men hearkened to their words; and so Jarchi, they believed what they said on sight of their provisions; but, according to Kimchi and Ben Melech, they ate with them, to confirm the covenant they made with them; but had this been the case, as it sometimes was a custom to eat together at making covenants, see Genesis 26:30; the princes would doubtless have provided a better entertainment for such a purpose: the "margin" of our Bibles leads to the other sense,"they received the men by reason of their victuals:"
and asked not counsel at the mouth of the Lord; as they might and should have done, by desiring the high priest to inquire of the Lord by Urim and Thummim; but this they neglected, which, had they attended to, the fraud would have been discovered; or however, they would have had the mind of God about making peace with the Gibeonites, which in all likelihood he would not have disapproved of, they becoming proselytes, and giving up their possessions to Israel; but this did not excuse their neglect.

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, Psalm 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.

the men took of their victuals and asked not counsel at the mouth of the Lord--The mouldy appearance of their bread was, after examination, accepted as guaranteeing the truth of the story. In this precipitate conclusion the Israelites were guilty of excessive credulity and culpable negligence, in not asking by the high priest's Urim and Thummim the mind of God, before entering into the alliance. It is not clear, however, that had they applied for divine direction they would have been forbidden to spare and connect themselves with any of the Canaanite tribes who renounced idolatry and embraced and worshipped the true God. At least, no fault was found with them for making a covenant with the Gibeonites; while, on the other hand, the violation of it was severely punished (2-Samuel 21:1; and Joshua 11:19-20).

The Israelites suffered themselves to be taken in by this pretence. "The men (the elders of Israel) took of their provisions; but they did not ask the mouth of the Lord." Instead of inquiring the will of the Lord in this matter through the Urim and Thummim of the high priest (Numbers 27:21), they contented themselves with taking some of the bread that was shown them, and tasting it; as if the dry mouldy bread furnished a safe guarantee of the truth of the words of these foreign ambassadors. Some commentators regard their taking of their provisions as a sign of mutual friendship, or of the league which they made; but in that case their eating with them would at any rate have been mentioned. Among the Arabs, simply eating bread and salt with a guest is considered a sign of peace and friendship.

The men - That is, the princes. Their victuals - That they might examine the truth of what they said. The mouth of the Lord - As they ought to have done upon all such weighty occasions. So they are accused of rashness and neglect of their duty. For though it is probable, if God had been consulted, he would have consented to the sparing of the Gibeonites; yet it should have been done with more caution, and an obligation upon them to embrace the true religion. In every business of importance, we should stay to take God along with us, and by the word and prayer consult him. Many a time our affairs miscarry, because we asked not counsel at the mouth of the Lord. Did we acknowledge him in all our ways, they would be more safe, easy and successful.