Exodus 11:4-5 ▼

4 So Moses said, “Thus says Yahweh, ‘About midnight I am going out into the midst of Egypt,

5 and all the firstborn in the land of Egypt shall die, from the firstborn of the Pharaoh who sits on his throne, even to the firstborn of the servant-girl who is behind the millstones; and all the firstborn of the cattle.