²¹ Adonai said to Moses, “When you go back to Egypt, see that you do all the wonders before Pharaoh that I have put in your hand. Still, I will harden his heart, and he will not let the people go. ²² You are to say to Pharaoh, “This is what Adonai says: ‘Israel is My son, My firstborn. ²³ So I have said to you, Let My son go, that he may serve Me, but you have refused to let him go. Behold, I will slay your son, your firstborn.’”