Exodus 11:4-6

New International Version

⁴ So Moses said, “This is what the Lord says: ‘About midnight^(A) I will go throughout Egypt.^{(B) 5} Every firstborn^(C) son in Egypt will die, from the firstborn son of Pharaoh, who sits on the throne, to the firstborn son of the female slave, who is at her hand mill,^(D) and all the firstborn of the cattle as well. ⁶ There will be loud wailing^(E) throughout Egypt—worse than there has ever been or ever will be again.