Exodus 10:26

Our cattle also shall go with us. — Once more Moses rejects the proffered compromise — rejects it absolutely and altogether. The cattle shall all go with the people; “not an hoof shall be left behind.” And why? First, because it is theirs (“our cattle,” “our flocks,” “our herds”), and not Pharaoh’s; secondly, because it is God’s — all, to the last head, if He requires it; and He has not said as yet how much of it He will require. The festival to be held in the wilderness is altogether a new thing; its ritual has not at present been laid down. The people will only be told “with what they must serve the Lord” when they are come to the place where they are to serve Him: i.e., to Sinai (Exodus 3:12).