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.”
And it came to pass at the end of three days after they had made a league with them, that they heard that they were their neighbours, and that they dwelt among them.
And the children of Israel journeyed, and came unto their cities on the third day. Now their cities were Gibeon, and Chephirah, and Beeroth, and Kirjath–jearim.
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.
But all the princes said unto all the congregation, We have sworn unto them by the Lord God of Israel: now therefore we may not touch them.
This we will do to them; we will even let them live, lest wrath be upon us, because of the oath which we sware unto them.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“In whose eyes a vile person is contemned; but he honoureth them that fear the Lord. He that sweareth to his own hurt, and changeth not.”
“Now therefore, I pray you, swear unto me by the Lord, since I have shewed you kindness, that ye will also shew kindness unto my father’s house, and give me a true token:”
“And when the Lord thy God shall deliver them before thee; thou shalt smite them, and utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:”
“In whose eyes a vile person is contemned; but he honoureth them that fear the Lord. He that sweareth to his own hurt, and changeth not.”
“But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of the Lord’s oath that was between them, between David and Jonathan the son of Saul.”