Exodus 1:12-14, 22

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.

And Pharaoh charged all his people, saying, Every son that is born ye shall cast into the river, and every daughter ye shall save alive.