Joshua 9:18-20

MLV(i) 18 And the sons of Israel did not kill* them, because the rulers of the congregation had sworn to them by Jehovah, the God of Israel. And all the congregation murmured against the rulers. 19 But all the rulers said to all the congregation, We have sworn to them by Jehovah, the God of Israel, now therefore we may not touch them.
20 This we will do to them and let them live, lest wrath be upon us because of the oath which we swore to them.