Shemoth (Exodus) 11:5-6

and all the first-born in the land of Mitsrayim shall die, from the first-born of Pharaoh who sits on his throne, even to the first-born of the female servant who is behind the handmill, and all the first-born of cattle. ‘And there shall be a great cry throughout all the land of Mitsrayim, such as has never been or ever shall be again.