Joshua 9:18

“And the children of Israel smote them not, etc.] The inhabitants of the four cities, when they came to them, though they found it to be a true report that was brought them of their being neighbours, and that they were imposed upon by them: because the princes of the congregation had sworn unto them by the Lord God of Israel; by the Word of the Lord God of Israel, as the Targum, and therefore they restrained the people from smiting and plundering them; for it was not the oath of the princes the people so much regarded, or had such an influence on them as to abstain from seizing on them, but the princes, by reason of their oath, would not suffer them to touch them: and all the congregation…”

“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…”

“Against the princes - Both from that proneness which is in people to censure the actions of their rulers; and from their desire of the spoil of these cities. Joshua 9:21”

“9:18-21 Israel was not entitled to break this treaty even though the Gibeonites deceived the Israelites into making it. Breaking a covenant sworn by an oath in the presence of the Lord would have made light of God’s name and honor (cp. Gen 27:30-38).”

“had sworn: Sa2 21:7; Psa 15:4; Ecc 5:2, Ecc 5:6, Ecc 9:2 Joshua 9:19”

“"The Israelites smote them not," sc., with the edge of the sword, "because the princes of the congregation had sworn to them," sc., to let them live ( Jos 9:15); but, notwithstanding the murmuring of the congregation, they declared that they might not touch them because of their oath. "This (sc., what we have sworn) we will do to them, and let them live (החיה, inf. abs. with special emphasis instead of the finite verb), lest wrath come upon us because of the oath." Wrath (sc., of God), a judgment such as fell upon Israel in the time of David, because Saul disregarded this oath and sought to destroy the Gibeonites ( Sa2 21:1.). But how could the elders of Israel consider themselves bound by…”