18 Moses went back to his father-in-law Jethro and said to him, "Please let me go back to my kindred in Egypt and see whether they are still living." And Jethro said to Moses, "Go in peace." 19 The Lord said to Moses in Midian, "Go back to Egypt; for all those who were seeking your life are dead." 20 So Moses took his wife and his sons, put them on a donkey, and went back to the land of Egypt; and Moses carried the staff of God in his hand. 21 And the Lord said to Moses, "When you go back to Egypt, see that you perform before Pharaoh all the wonders that I have put in your power; but I will harden his heart, so that he will not let the people go. 22 Then you shall say to Pharaoh, "Thus says the Lord: Israel is my firstborn son. 23 I said to you, "Let my son go that he may worship me." But you refused to let him go; now I will kill your firstborn son.' "
Matthew Henry's Commentary on Exodus 4:18-23
Commentary on Exodus 4:18-23
(Read Exodus 4:18-23)
After God had appeared in the bush, he often spake to Moses. Pharaoh had hardened his own heart against the groans and cries of the oppressed Israelites; and now God, in the way of righteous judgment, hardens his heart against the teaching of the miracles, and the terror of the plagues. But whether Pharaoh will hear, or whether he will forbear, Moses must tell him, Thus saith the Lord. He must demand a discharge for Israel, Let my son go; not only my servant, whom thou hast no right to detain, but my son. It is my son that serves me, and therefore must be spared, must be pleaded for. In case of refusal I will slay thy son, even thy first-born. As men deal with God's people, let them expect so to be dealt with.