Exodus 1:12-14, 22

But the more they afflicted them, the more they multiplied and grew. And they were grieved because of the children of Israel. And the Egyptians made the children of Israel to serve with rigour: and they made their lives bitter with hard bondage, in morter, and in brick, and in all manner of service in the field: all their service, wherein they made them serve, was with rigour.

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.