Exodus 1:11, 22

So the Egyptians made the Israelites their slaves. They appointed brutal slave drivers over them, hoping to wear them down with crushing labor. They forced them to build the cities of Pithom and Rameses as supply centers for the king.

Then Pharaoh gave this order to all his people: “Throw every newborn Hebrew boy into the Nile River. But you may let the girls live.”