18 And Moses went back to Jethro, his father-in-law, and said to him, Let me go back now to my relations in Egypt and see if they are still living. And Jethro said to Moses, Go in peace. 19 And the Lord said to Moses in Midian, Go back to Egypt, for all the men are dead who were attempting to take your life. 20 And Moses took his wife and his sons and put them on an ass and went back to the land of Egypt: and he took the rod of God in his hand. 21 And the Lord said to Moses, When you go back to Egypt, see that you do before Pharaoh all the wonders which I have given you power to do: but I will make his heart hard and he will not let the people go. 22 And you are to say to Pharaoh, The Lord says, Israel is the first of my sons: 23 And I said to you, Let my son go, so that he may give me worship; and you did not let him go: so now I will put the first of your sons to death.
24 Now on the journey, at the night's resting-place, the Lord came in his way and would have put him to death. 25 Then Zipporah took a sharp stone, and cutting off the skin of her son's private parts, and touching his feet with it, she said, Truly you are a husband of blood to me. 26 So he let him go. Then she said, You are a husband of blood because of the circumcision.
Matthew Henry's Commentary on Exodus 4:18-26
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.
Commentary on Exodus 4:24-31
(Read Exodus 4:24-31)
God met Moses in anger. The Lord threatened him with death or sent sickness upon him, as the punishment of his having neglected to circumcise his son. When God discovers to us what is amiss in our lives, we must give all diligence to amend it speedily. This is the voice of every rod; it calls us to return to Him that smites us. God sent Aaron to meet Moses. The more they saw of God's bringing them together, the more pleasant their interview was. The elders of Israel met them in faith, and were ready to obey them. It often happens, that less difficulty is found than was expected, in such undertakings as are according to the will of God, and for his glory. Let us but arise and try at our proper work, the Lord will be with us and prosper us. If Israel welcomed the tidings of their deliverance, and worshipped the Lord, how should we welcome the glad tidings of redemption, embrace it in faith, and adore the Redeemer!