Exodus 1:11-14

Therefore they did set over them taskmasters to afflict them with their burdens. And they built for Pharaoh store-cities, Pithom and Raamses. But the more they afflicted them, the more they multiplied and the more they spread abroad. And they were grieved because of the children of Israel. And the Egyptians made the children of Israel to serve with rigor: and they made their lives bitter with hard service, in mortar and in brick, and in all manner of service in the field, all their service, wherein they made them serve with rigor.