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All the firstborn are mine; for on the day that I smote all the firstborn in the land of Egypt I hallowed unto me all the firstborn in Israel, both man and beast: mine shall they be: I am the LORD. 3:13
Trivia: God stopped killing people for "committing whoredom with the daughters of Moab" because "his wrath was turned away" by a man who thrust a javelin through a man of Israel and a daughter of Moab.