John Gill Commentary Exodus 10:26

"Our cattle also shall go with us; there shall not a hoof be left behind: for thereof must we take to serve Jehovah our God; and we know not with what we must serve Jehovah, until we come thither." — Exodus 10:26 (ASV)

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
there;
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 had gotten into the wilderness; so that this was not a mere pretence to get their cattle along with them, but was the true case and real matter of fact.