Exodus 11:3-5

Darby Translation

³ And Jehovah gave the people favour in the eyes of the Egyptians. Moreover the man Moses was very great in the land of Egypt—in the eyes of Pharaoh's bondmen, and in the eyes of the people.

⁴ And Moses said, Thus saith Jehovah: About midnight I will 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 on his throne, even unto the firstborn of the bondwoman that is behind the mill; and all the firstborn of cattle.