But against none of the children of Israel shall a dog move its tongue, against man or beast, that you may know that the Lord does make a difference between the Egyptians and Israel. (Exodus 11:7)
During the last of the ten plagues, Moses spoke boldly against Pharoah: the Lord will go into the midst of Egypt and kill all the firstborn in the land of Egypt. This plague was the climax to the story of God’s deliverance of His people, after the Egyptians had undergone lengthy suffering and before Pharoah finally cast the Israelites out of his land in devastation from the loss of his firstborn. At the end, the Lord had gained victory and displayed His majestic powers. The Lord had shown that He does make a difference between the Egyptians and those who He calls His own.