Let me go, I pray thee, and return unto my brethren - Moses, having received his commission from God, and directions how to execute it, returned to his father-in-law, and asked permission to visit his family and brethren in Egypt, without giving him any intimation of the great errand on which he was going. His keeping this secret has been attributed to his singular modesty: but however true it might be that Moses was a truly humble and modest man, yet his prudence alone was sufficient to have induced him to observe silence on this subject; for, if once imparted to the family of his father-in-law, the news might have reached Egypt before he could get thither, and a general alarm among the Egyptians would in all probability have been the consequence; as fame would not fail to represent Moses as coming to stir up sedition and rebellion, and the whole nation would have been armed against them. It was therefore essentially necessary that the business should be kept secret.

In the Septuagint and Coptic the following addition is made to this verse: Μετα δε τας ἡμερας τας πολλας εκινας ετελευτησεν ὁ βασιλευς Αιγυπτου· After these many days, the king of Egypt died. This was probably an ancient gloss or side note, which in process of time crept into the text, as it appeared to throw light on the following verse.

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.

In consequence of this appearance of God, Moses took leave of his father-in-law to return to his brethren in Egypt, though without telling him the real object of his journey, no doubt because Jethro had not the mind to understand such a divine revelation, though he subsequently recognised the miracles that God wrought for Israel (Exodus 18). By the "brethren" we are to understand not merely the nearer relatives of Moses, or the family of Amram, but the Israelites generally. Considering the oppression under which they were suffering at the time of Moses' flight, the question might naturally arise, whether they were still living, and had not been altogether exterminated.

And Moses went and returned to Jethro his father in law, and said unto him, Let me go, I pray thee, and return unto my brethren which are in Egypt, and see whether they be yet alive. And Jethro said to Moses, Go in peace.

Jethro: Heb. Jether

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.

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.