Joshua 9:18
And the children of Israel smote them not, because the princes of the congregation had sworn unto them by the Lord God of Israel. And all the congregation murmured against the princes.
Cross-reference
Joshua 2:12 records the oath to Rahab, another non-Israelite, which the spies kept—parallel to the Gibeonite oath kept by the princes.
Joshua 6:22 shows the fulfillment of the oath to Rahab—a narrative parallel to the Gibeonite oath being honored in Joshua 9:18.
In 2 Samuel 21:7, David spares Mephibosheth due to his oath to Jonathan—a parallel to the princes honoring the Gibeonite oath despite personal cost.
Psalm 15:4 describes the righteous as one who swears to his own hurt and does not change—exactly the principle the princes followed with the Gibeonite oath.
Ecclesiastes 5:2 warns against rash words before God—the very mistake Israel made by hastily swearing an oath to the Gibeonites without inquiry.
Ecclesiastes 5:6 warns against claiming a vow was an error—the princes refused to do that, keeping the Gibeonite oath even though obtained deceitfully.
Deuteronomy 7:2 commands Israel to make no covenant with Canaanites—the very command the princes violated by swearing an oath to the Gibeonites.