Joshua 9:18-20

18But the Israelites did not attack them, because the leaders of the community had sworn an oath to them by the Lord, the God of Israel. Then the whole community grumbled against the leaders.

19All the leaders answered them, “We have sworn an oath to them by the Lord, the God of Israel, and now we cannot touch them.

20This is how we will treat them: we will let them live, so that no wrath will fall on us because of the oath we swore to them.”