Exodus 4:18-23

18Then Moses departed and returned to 1his father-in-law 2Jethro, and said to him, “Please, let me go, that I may return to my brothers who are in Egypt, and see if they are still alive.” And Jethro said to Moses, “Go in peace.” 19Now the Lord said to Moses in Midian, “Go 3back to Egypt, for 4all the men who were seeking your life are dead.” 20So Moses took his wife and his 5sons and mounted them on a donkey, and returned to the land of Egypt. Moses also took the 6staff of God in his hand.

21And the Lord said to Moses, “When you go 7back to Egypt, see that you perform before Pharaoh all 8the wonders which I have put in your 9power; but 10I will harden his heart so that he will not let the people go. 22Then you shall say to Pharaoh, ‘This is what the Lord says: “11Israel is My son, My firstborn. 23So I said to you, ‘12Let My son go so that he may serve Me’; but you have refused to let him go. Behold, 13I am going to kill your son, your firstborn.”’”