Exo 4:23, 11:5 | ESV | STEP | and I say to you, Let my son go that he may serve me. If you refuse to let him go , behold, I will kill your firstborn son .

Exodus 4:23

23 and I say to you, “Let my son go that he may serve me.” If you refuse to let him go, behold, I ^awill kill your firstborn son.’”

Exodus 11:5

5 and every firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sits on his throne, even to the firstborn of the slave girl who is ^bbehind the handmill, and all the firstborn of the cattle.