Exodus 4:21 And the Lord said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. 10 I MC VC

Exodus 4:22 And thou shalt say unto Pharaoh, Thus saith the Lord, Israel is my son, even my firstborn: 10 I MC VC

Exodus 4:23 And I say unto thee, Let my son go, that he may serve me: and if thou refuse to let him go, behold, I will slay thy son, even thy firstborn. 10 I MC VC