Numbers 8:16-18

Amplified Bible, Classic Edition

¹⁶ For they are wholly given to Me from among the Israelites; instead of all who open the womb, the firstborn of all the Israelites, I have taken the Levites for Myself.

¹⁷ For all the firstborn of the Israelites are Mine, both of man and beast; on the day that I smote every firstborn in the land of Egypt [not of Israel], I consecrated them and set them apart for Myself.

¹⁸ And I have taken the Levites instead of all the firstborn of the Israelites.