Exodus 11:5 in the King James Version
And all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh that sitteth upon his throne, even unto the firstborn of the maidservant that is behind the mill; and all the firstborn of beasts.
Context
4 Moses said, “This is what the LORD says: ‘About midnight I will go out into the middle of Egypt,
5 and all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sits on his throne, even to the firstborn of the female servant who is behind the mill, and all the firstborn of livestock.
6 There will be a great cry throughout all the land of Egypt, such as there has not been, nor will be any more.