Three days after they had made the treaty with the Gibeonites, the Israelites learned that they were neighbors, living among them.
16. And it came to pass, etc. The chastisement of their levity by the discovery of the fraud, three days after, must, by the swiftness of the punishment, have made them more sensible of the shame and disgrace. For it was thus known, that through sloth and lethargy, they had very stupidly fallen into error from not having taken the trouble to inquire into a...
The princes joined Joshua in this treaty, treating them as partners in government, not underlings. An oath by the God of Israel sealed it, but the whole mischief lay in haste: they examined the bread by taste and sight alone, never reasoning whether stale provisions proved a distant home. Sense without understanding made fools of them.
AI summary
Commenting on Joshua 9:15-21
And it came to pass at the end of three days, after they had made a league with them,.... The league seems to have been made the same day they came; the Gibeonites were no doubt in haste to have it concluded, lest they should be discovered; and Joshua, and the princes of Israel, took no pains, and gave themselves no great trouble to inquire...