Exodus 1:8-11

8Now there arose a new king over Egypt, who knew not Joseph. 9And he said to his people, Behold, the people of the children of Israel are more and mightier than we: 10Come, let us deal wisely with them; lest they multiply, and it shall come to pass, that, when war happeneth, they will join with our enemies, and fight against us, and depart from the land. 11Therefore they set over them taskmasters to afflict them with their burdens. And they built for Pharaoh treasure cities, Pithom and Raamses.