Numbers 3:12-14 American Standard Version (ASV)
12 And I, behold, I have taken the Levites from among the children of Israel instead of all the first-born that openeth the womb among the children of Israel; and the Levites shall be mine: 13 for all the first-born are mine; on the day that I smote all the first-born in the land of Egypt I hallowed unto me all the first-born in Israel, both man and beast; mine they shall be: I am Jehovah.
14 And Jehovah spake unto Moses in the wilderness of Sinai, saying,
Numbers 3:12-14 New International Version (NIV)
12 “I have taken the Levites from among the Israelites in place of the first male offspring of every Israelite woman. The Levites are mine, 13 for all the firstborn are mine. When I struck down all the firstborn in Egypt, I set apart for myself every firstborn in Israel, whether human or animal. They are to be mine. I am the Lord.”
14 The Lord said to Moses in the Desert of Sinai,