1 Then Yahweh said to Moses, "Go in to Pharaoh, and tell him, 'This is what Yahweh, the God of the Hebrews, says: "Let my people go, that they may serve me.
*Minor differences ignored. Grouped by changes, with first version listed as example.
Then the Lord said. No complaint or expostulation of Moses is here recounted; and it is possible that he was quiet and silent, whilst God foresaw what it was necessary to do, and even commanded what He would have done. But since he only gives a brief summary of occurrences, we may probably conjecture that, as the evil grew worse, he had recourse from time to time to the remedy. In the denunciation, "the Lord God of the Hebrews" is no unmeaning repetition, that Pharaoh may learn that he, whom he thought to have repelled in the abundance of his pride, was still in the field against him. For God insults his ferocity, and by setting forth his name contemptuously defies his wrath. We have already said that Pharaoh is convicted of sacrilege, both in his oppression of God's people and in defrauding God Himself of His due honor; therefore those words, "Let my people go, that they may serve me," have the force of aggravating his sin.
The Lord God of the Hebrews - It is very likely that the term Lord, יויה Yehovah, is used here to point out particularly his eternal power and Godhead; and that the term God, אלהי Elohey, is intended to be understood in the sense of Supporter, Defender, Protector, etc. Thus saith the self-existent, omnipotent, and eternal Being, the Supporter and Defender of the Hebrews, "Let my people go, that they may worship me."
Then the Lord said unto Moses,.... The same day the plague of the flies was removed:
go in unto Pharaoh boldly, without any fear of him or his court:
and tell him, thus saith the Lord God of the Hebrews: speak in the name of Jehovah, the God whom the Hebrews worship, and who owns them for his people, and has a special love for them, and takes a special care of them, and is not ashamed to be called their God, as poor and as oppressed as they be:
let my people go, that they may serve me; this demand had been often made, and, though so reasonable, was refused.
God will have Israel released, Pharaoh opposes it, and the trial is, whose word shall stand. The hand of the Lord at once is upon the cattle, many of which, some of all kinds, die by a sort of murrain. This was greatly to the loss of the owners; they had made Israel poor, and now God would make them poor. The hand of God is to be seen, even in the sickness and death of cattle; for a sparrow falls not to the ground without our Father. None of the Israelites' cattle should die; the Lord shall sever. The cattle died. The Egyptians worshipped their cattle. What we make an idol of, it is just with God to remove from us. This proud tyrant and cruel oppressor deserved to be made an example by the just Judge of the universe. None who are punished according to what they deserve, can have any just cause to complain. Hardness of heart denotes that state of mind upon which neither threatenings nor promise, neither judgements nor mercies, make any abiding impression. The conscience being stupified, and the heart filled with pride and presumption, they persist in unbelief and disobedience. This state of mind is also called the stony heart. Very different is the heart of flesh, the broken and contrite heart. Sinners have none to blame but themselves, for that pride and ungodliness which abuse the bounty and patience of God. For, however the Lord hardens the hearts of men, it is always as a punishment of former sins.
The fifth plague consisted of a severe Murrain, which carried off the cattle (מקנה, the living property) of the Egyptians, that were in the field. To show how Pharaoh was accumulating guilt by his obstinate resistance, in the announcement of this plague the expression, "If thou refuse to let them go" (cf. Exodus 8:2), is followed by the words, "and wilt hold them (the Israelites) still" (עוד still further, even after Jehovah has so emphatically declared His will).
*More commentary available at chapter level.