Exodus 11:4-6

New Revised Standard Version, Anglicised

⁴ Moses said, ‘Thus says the Lord: About midnight I will go out through Egypt. ⁵ Every firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sits on his throne to the firstborn of the female slave who is behind the handmill, and all the firstborn of the livestock. ⁶ Then there will be a loud cry throughout the whole land of Egypt, such as has never been nor will ever be again.