Exodus 10:24-26

Finally, Pharaoh called for Moses. “Go and worship the LORD,” he said. “But leave your flocks and herds here. You may even take your little ones with you.” “No,” Moses said, “you must provide us with animals for sacrifices and burnt offerings to the LORD our God. All our livestock must go with us, too; not a hoof can be left behind. We must choose our sacrifices for the LORD our God from among these animals. And we won’t know how we are to worship the LORD until we get there.”