Joshua 9:18-20

18But the sons of Israel did not 1attack them because the leaders of the congregation had sworn to them by the Lord, the God of Israel. And the whole congregation grumbled against the leaders.

19But all the leaders said to the whole congregation, “We have sworn to them by the Lord, the God of Israel, and now we cannot touch them.

20This we will do to them, even let them live, so that wrath will not be on us because of the oath which we swore to them.”