Bilangan 3:12-13

3:12 “Look, ¹  I myself have taken the Levites from among the Israelites instead of ²  every firstborn who opens the womb among the Israelites. So the Levites belong to me, 3:13 because all the firstborn are mine. When I destroyed ³  all the firstborn in the land of Egypt, I set apart for myself all the firstborn in Israel, both man and beast. They belong to me. I am the Lord.” ⁴ 

Bilangan 8:17

8:17 For all the firstborn males among the Israelites are mine, both humans and animals; when I destroyed ⁵  all the firstborn in the land of Egypt I set them apart for myself.

[3:12]  ¹ tn The particle הִנֵּה (hinneh) here carries its deictic force, calling attention to the fact that is being declared. It is underscoring the fact that the Lord himself chose Levi.

[3:12]  ² tn Literally “in the place of.”

[3:13]  ³ tn The form הַכֹּתִי (hakkoti) is the Hiphil infinitive construct of the verb נָכָה (nakhah, “to strike, smite, attack”). Here, after the idiomatic “in the day of,” the form functions in an adverbial clause of time – “when I destroyed.”

[3:13]  ⁴ sn In the Exodus event of the Passover night the principle of substitution was presented. The firstborn child was redeemed by the blood of the Lamb and so belonged to God, but then God chose the Levites to serve in the place of the firstborn. The ritual of consecrating the firstborn son to the Lord was nevertheless carried out, even with Jesus, the firstborn son of Mary (Luke 2:22-23).

[8:17]  ⁵ 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.”