God Kills the First Born of Egypt

So Moses announced to Pharaoh, “This is what the LORD says: About midnight I will pass through Egypt.  All the firstborn sons will die in every family in Egypt, from the oldest son of Pharaoh, who sits on the throne, to the oldest son of his lowliest slave. Even the firstborn of the animals will die.  Then a loud wail will be heard throughout the land of Egypt; there has never been such wailing before, and there never will be again.  But among the Israelites it will be so peaceful that not even a dog will bark. Then you will know that the LORD makes a distinction between the Egyptians and the Israelites.  All the officials of Egypt will come running to me, bowing low.  ‘Please leave!’ they will beg.  ‘Hurry!  And take all your followers with you.’  Only then will I go!”  Then, burning with anger, Moses left Pharaoh’s presence.  Now the LORD had told Moses, “Pharaoh will not listen to you.  But this will give me the opportunity to do even more mighty miracles in the land of Egypt.”  Although Moses and Aaron did these miracles in Pharaoh’s presence, the LORD hardened his heart so he wouldn’t let the Israelites leave the country.  (Exodus 11:4-10 NLT)