Exodus 1:10-12
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10Come, let us deal wisely with them, lest they multiply, and it happen that when any war breaks out, they also join themselves to our enemies, and fight against us, and escape out of the land." 11Therefore they set taskmasters over them to afflict them with their burdens. They built storage cities for Pharaoh: Pithom and Raamses. 12But the more they afflicted them, the more they multiplied and the more they spread out. They were grieved because of the children of Israel.
Exodus 1:10-12 (WEB)