Joshua 9:16-21

16And 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. 17And the children of Israel journeyed, and came to their cities on the third day. Now their cities were Gibeon, and Chephirah, and Beeroth, and Kirjathjearim. 18And the children of Israel smote them not, because the princes of the congregation had sworn to them by the LORD God of Israel. And all the congregation murmured against the princes. 19But all the princes said to all the congregation, We have sworn to them by the LORD God of Israel: now therefore we may not touch them. 20This we will do to them; we will even let them live, lest wrath be upon us, because of the oath which we swore to them. 21And the princes said to them, Let them live; but let them be hewers of wood and drawers of water to all the congregation; as the princes had promised them.