Parallel
Exodus 4:23
Brenton's English Septuagint · Berean Standard Bible
And I said to thee, Send away my people, that they may serve me: now if thou wilt not send them away, see, I will slay thy first-born son.
and I told you to let My son go so that he may worship Me. But since you have refused to let him go, behold, I will kill your firstborn son!’”