18 And Moses went and returned to Jethro his father-in-law, and said to him, Let me go, I pray thee, and return to my brethren who are in Egypt, that I may see whether they are yet alive. And Jethro said to Moses, Go in peace. 19 And Jehovah said to Moses in Midian, Go, return to Egypt; for all the men are dead who sought thy life. 20 And Moses took his wife and his sons, and set them riding upon an ass, and he returned to the land of Egypt. And Moses took the staff of God in his hand. 21 And Jehovah said to Moses, When thou goest to return to Egypt, see that thou do all the wonders before Pharaoh that I have put in thy hand. And I will harden his heart, that he shall not let the people go. 22 And thou shalt say to Pharaoh, Thus saith Jehovah: Israel is my son, my firstborn. 23 And I say to thee, Let my son go, that he may serve me. And if thou refuse to let him go, behold, I will kill thy son, thy firstborn.
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.