Exodus 11:3-5

21st Century King James Version

³ And the Lord gave the people favor in the sight of the Egyptians. Moreover the man Moses was very great in the land of Egypt in the sight of Pharaoh’s servants and in the sight of the people.

⁴ And Moses said, “Thus saith the Lord: ‘About midnight will I go out into the midst of Egypt;

⁵ and all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sitteth upon his throne, even unto the firstborn of the maidservant who is behind the mill, and all the firstborn of beasts.