Exodus 11:7 in the King James Version
But against any of the children of Israel shall not a dog move his tongue, against man or beast: that ye may know how that the LORD doth put a difference between the Egyptians and Israel.
Context
6 There will be a great cry throughout all the land of Egypt, such as there has not been, nor will be any more.
7 But against any of the children of Israel a dog won’t even bark or move its tongue, against man or animal, that you may know that the LORD makes a distinction between the Egyptians and Israel.
8 All these servants of yours will come down to me, and bow down themselves to me, saying, “Get out, with all the people who follow you;” and after that I will go out.’” He went out from Pharaoh in hot anger.