Exodus 11:4-6

New Century Version

⁴ So Moses said to the king, “This is what the Lord says: ‘About midnight tonight I will go through all Egypt. ⁵ Every firstborn son in the land of Egypt will die—from the firstborn son of the king, who sits on his throne, to the firstborn of the slave girl grinding grain. Also the firstborn farm animals will die. ⁶ There will be loud outcries everywhere in Egypt, worse than any time before or after this.