Exodus 11:7-9

7But not even a dog will threaten any of the Israelites, whether man or animal, so that you may know [without any doubt] and acknowledge how the Lord makes a distinction between Egypt and Israel.’

8All these servants of yours will come down to me and bow down before me, saying, ‘Get out, you and all the people who follow you.’ After that I will leave.” And he left Pharaoh in the heat of anger.

9Then the Lord said to Moses, “Pharaoh will not listen to you, so that My wonders (miracles) may be multiplied in the land of Egypt.”