Exodus 11:3-5

New Century Version

³ The Lord had caused the Egyptians to respect the Israelites, and both the king’s officers and the Egyptian people considered Moses to be a great man.

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.