Thematic Bible: Tribe of levi taken instead of the first-born

And the LORD spoke unto Moses, saying, And I, behold, I have taken the Levites from among the children of Israel instead of all the firstborn that opens the womb among the children of Israel: therefore the Levites shall be mine; Because all the firstborn are mine; for on the day that I struck all the firstborn in the land of Egypt I hallowed unto me all the firstborn in Israel, both man and animal: mine shall they be: I am the LORD.