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.

Verses 18-25. - If Moses had, as we have supposed, been accepted into the Midianitish nation, he would need permission to withdraw himself from the tribal head. This head was now Jether, or Jethro, Moses' connexion by marriage, perhaps his brother-in-law, perhaps a less near connexion. Nations and tribes were at this time anxious to keep up their numbers, and jealous of the desertion even of a single member. Jethro, however, made no opposition to the return of Moses to Egypt, even though he designed to be accompanied by his wife and sons (ver. 20). Scripture gives no indications of the motives which actuated him. Perhaps the Midianites were at this time straitened for want of room. Perhaps the peculiar circumstances of Moses were held to justify his application for leave. Verse 18. - My brethren probably means here "my relations" (compare Genesis 13:8; Genesis 29:12). Moses could scarcely doubt but that some of his countrymen were still living. It would not have been for the interest of the Egyptians to exterminate them. Go in peace means, "you have my leave - I do not oppose your going."

And Moses went and returned to Jethro his father in law,.... With his flock of sheep he kept, Exodus 3:1, and said unto him:

let me go, I pray thee, and return to my brethren which are in Egypt; the Israelites, who were so by nation and religion; as Jethro had been kind and beneficent to him, he did not choose to leave him without his knowledge and consent, and especially to take away his wife and children without it:

and see whether they be yet alive; it seems by this that Moses had heard nothing of them during the forty years he lived in Midian, which may be thought strange, since it was not very far from Egypt; and besides the Midianites traded in Egypt, as we learn from Genesis 37:28 but this must be ascribed to the providence of God, that so ordered it, that there should be no intercourse between him and his brethren, that so no step might be taken by them for their deliverance until the set time was come. Moses did not acquaint his father-in-law with the principal reason of his request, nor of his chief end in going into Egypt, which it might not be proper to acquaint him with, he being of another nation, though a good man; and lest he should use any arguments to dissuade Moses from going, who now having got clear of his diffidence and distrust, was determined upon it: though some ascribe this to his modesty in not telling Jethro of the glorious and wonderful appearance of God to him, and of the honour he had conferred on him to be the deliverer and governor of the people of Israel:

and Jethro said to Moses, go in peace; he judged his request reasonable, and gave his full consent to it, and wished him health and prosperity in his journey.

18. Moses … returned to Jethro—Being in his service, it was right to obtain his consent, but Moses evinced piety, humility, and prudence, in not divulging the special object of his journey.

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