We know not with what we must serve the Lord, etc. - The law was not yet given; the ordinances concerning the different kinds of sacrifices and offerings not known. What kind and what number of animals God should require to be sacrificed, even Moses himself could not as yet tell. He therefore very properly insists on taking the whole of their herds with them, and not leaving even one hoof behind.

Our cattle also shall go with us,.... Of every kind, of the flocks and of the herds:

there shall not an hoof be left behind; not a single creature that has an hoof: it is a proverbial expression, signifying that they should carry all that belonged to them with them:

for thereof must we take to serve the Lord our God; something of every kind and sort, all they had being devoted to his service, and to be yielded to him upon demand:

and we know not with what we must serve the Lord, until we come thither; into the wilderness; they knew not exactly and precisely what kind of creatures or how many of them, as Aben Ezra observes, they were to offer at a time; for though before this there was a known distinction between clean and unclean creatures, and the various offerings and sacrifices of the patriarchs might in a good measure direct them in the use of them; yet the special and peculiar laws about sacrifices were not given until after their deliverance, and they were got into the wilderness; so that this was not a bare pretence to get their cattle along with them, but was the true case and real matter of fact.

Our cattle also shall go with us; there shall not an {i} hoof be left behind; for thereof must we take to serve the LORD our God; and we know not {k} with what we must serve the LORD, until we come thither.

(i) The ministers of God should not yield one iota to the wicked, in regards to their mission.

(k) That is, with what beasts, or how many.

10:21-29 The plague of darkness brought upon Egypt was a dreadful plague. It was darkness which might be felt, so thick were the fogs. It astonished and terrified. It continued three days; six nights in one; so long the most lightsome palaces were dungeons. Now Pharaoh had time to consider, if he would have improved it. Spiritual darkness is spiritual bondage; while Satan blinds men's eyes that they see not, he binds their hands and feet, that they work not for God, nor move toward heaven. They sit in darkness. It was righteous with God thus to punish. The blindness of their minds brought upon them this darkness of the air; never was mind so blinded as Pharaoh's, never was air so darkened as Egypt. Let us dread the consequences of sin; if three days of darkness were so dreadful, what will everlasting darkness be? The children of Israel, at the same time, had light in their dwellings. We must not think we share in common mercies as a matter of course, and therefore that we owe no thanks to God for them. It shows the particular favour he bears to his people. Wherever there is an Israelite indeed, though in this dark world, there is light, there is a child of light. When God made this difference between the Israelites and the Egyptians, who would not have preferred the poor cottage of an Israelite to the fine palace of an Egyptian? There is a real difference between the house of the wicked, which is under a curse, and the habitation of the just, which is blessed. Pharaoh renewed the treaty with Moses and Aaron, and consented they should take their little ones, but would have their cattle left. It is common for sinners to bargain with God Almighty; thus they try to mock him, but they deceive themselves. The terms of reconciliation with God are so fixed, that though men dispute them ever so long, they cannot possibly alter them, or bring them lower. We must come to the demand of God's will; we cannot expect he should condescend to the terms our lusts would make. With ourselves and our children, we must devote all our worldly possessions to the service of God; we know not what use he will make of any part of what we have. Pharaoh broke off the conference abruptly, and resolved to treat no more. Had he forgotten how often he had sent for Moses to ease him of his plagues? and must he now be bid to come no more? Vain malice! to threaten him with death, who was armed with such power! What will not hardness of heart, and contempt of God's word and commandments, bring men to! After this, Moses came no more till he was sent for. When men drive God's word from them, he justly gives them up to their own delusions.