Numbers 3:41

3:41 And take ¹  the Levites for me – I am the Lord – instead of all the firstborn males among the Israelites, and the livestock of the Levites instead of all the firstborn of the livestock of the Israelites.”

Numbers 8:17

8:17 For all the firstborn males among the Israelites are mine, both humans and animals; when I destroyed ²  all the firstborn in the land of Egypt I set them apart for myself.

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¹ tn The verb is the perfect tense with vav (ו) consecutive; it carries forward the instructions from the preceding verse. The verb “take” now has the sense of appointing or designating the Levites.

² tn The idiomatic “on the day of” precedes the infinitive construct of נָכָה (nakhah) to form the temporal clause: “in the day of my striking…” becomes “when I struck.”