Exodus 11:9 WBT

⁷  But against any of the children of Israel shall not a dog move his tongue, against man or beast: that ye may know how the LORD doth put a difference between the Egyptians and Israel.

⁸  And all these thy servants shall come down to me, and bow down themselves to me, saying, Depart thou, and all the people that follow thee; and after that I will depart: and he went out from Pharaoh in a great anger.

⁹  And the LORD said to Moses, Pharaoh will not hearken to you; that my wonders may be multiplied in the land of Egypt.

¹⁰  And Moses and Aaron did all these wonders before Pharaoh; and the LORD hardened Pharaoh's heart, so that he would not let the children of Israel depart from his land.