Exodus 11:7-9

7But where the Israelites are, not even a dog will be startled by any person or animal. This is how you will see that the Lord shows the distinction between Egypt and Israel.

8Then all these officials of yours will come, bow down to me, and say, ‘You and all the people who follow you, get out!’ After that I will leave.” Burning with anger, Moses left Pharaoh.

9The Lord had said to Moses, “Pharaoh will not listen to you. This is why I will do more amazing things in Egypt.”