Matthew Poole and continuators on Exodus 10:26

26 Our cattel also shall go with us, there shall not an hoof be left behind, for thereof must we take to serve the LORD our God: and we know not with what we must serve the LORD until we come thither .

Which was not a pretence, but a real truth. For this being a solemn and extraordinary sacrifice by the express and particular appointment of God, they knew not either of what kinds, or in what number or manner their sacrifices must be offered. And for all these things they did not receive particular directions till they came to mount Sinai.