Wherefore should the Egyptians speak and say,.... Those that remained, as the Targum of Jonathan, who were not drowned in the Red sea: a good man will be concerned for the honour and glory of God among the enemies of his people, that their mouths may not be opened to blaspheme the Lord and speak ill of his ways, see Joshua 7:9 and this is sometimes an argument with God himself, not to do that to his people they deserve, lest it should give occasion to the enemy to speak reproachfully, insult, and triumph, Deuteronomy 32:26.

for mischief did he bring them out, to slay them in the mountains, and to consume them from the face of the earth; that he brought them out of Egypt, not with a good but ill design; not to bring them into the land of Canaan, as they promised themselves, but to destroy them in the mountains; not to erect them into a great kingdom and nation, which should make a considerable figure in the world, but to cut them off from being a people at all: the mountains where they now were, were Sinai and Horeb, and there might be others thereabout, among which they were encamped: the Targum of Jonathan is,"among the mountains of Tabor, and Hermon, and Sirion, and Sinai:"

turn from thy fierce wrath, and repent of this evil against thy people; not that there is any turning or shadow of turning with God, or any change of his mind, or any such passions and affections in him as here expressed; but this is said after the manner of men concerning him, when he alters the course of his dealings with men according to his unalterable will, and does not do the evil threatened by him, and which the sins of men deserve.

Wherefore should the Egyptians speak, and say, For mischief did he bring them out, to slay them in the mountains, and to consume them from the face of the earth? Turn from thy fierce wrath, and repent of this evil against thy people.

32:12 Turn from thy fierce wrath - Not as if he thought God were not justly angry, but he begs that he would not be so greatly angry as to consume them. Let mercy rejoice against judgment; repent of this evil - Change the sentence of destruction into that of correction, against thy people which thou broughtest up out of Egypt - For whom thou hast done so great things? Wherefore should the Egyptians say, For mischief did he bring them out - Israel is dear to Moses, as his kindred, as his charge; but it is the glory of God that he is most concerned for. If Israel could perish without any reproach to God's name, Moses could persuade himself to sit down contented; but he cannot bear to hear God reflected on; and therefore this he insists upon, Lord, What will the Egyptians say? They will say, God was either weak, and could not, or fickle, and would not compleat the salvation he begun.

Margin repent

See Scofield Note: "Zech 8:14".

32:7-14 God says to Moses, that the Israelites had corrupted themselves. Sin is the corruption of the sinner, and it is a self-corruption; every man is tempted when he is drawn aside of his own lust. They had turned aside out of the way. Sin is a departing from the way of duty into a by-path. They soon forgot God's works. He sees what they cannot discover, nor is any wickedness of the world hid from him. We could not bear to see the thousandth part of that evil which God sees every day. God expresses the greatness of his just displeasure, after the manner of men who would have prayer of Moses could save them from ruin; thus he was a type of Christ, by whose mediation alone, God would reconcile the world to himself. Moses pleads God's glory. The glorifying God's name, as it ought to be our first petition, and it is so in the Lord's prayer, so it ought to be our great plea. And God's promises are to be our pleas in prayer; for what he has promised he is able to perform. See the power of prayer. In answer to the prayers of Moses, God showed his purpose of sparing the people, as he had before seemed determined on their destruction; which change of the outward discovery of his purpose, is called repenting of the evil.