for all the firstborn are Mine. On the day I struck down every firstborn in the land of Egypt, I consecrated to Myself all the firstborn in Israel, both man and beast. They are Mine; I am the LORD.”
Here, I. The family of Aaron is confirmed in the priests' office, Num 3:10. They had been called to it before, and consecrated; here they are appointed to wait on their priests' office: the apostle uses this phrase (Rom 12:7), Let us wait on our ministry.
Commenting on Numbers 3:1-13
Because all the firstborn are mine,.... Not merely in a general way, as all creatures are his, but in a special manner as his own, and that for the following reason: for on the day that I smote all the firstborn in the land of Egypt, I hallowed unto me all the firstborn in Israel, both man and beast; that is, sanctified or set them...
Num 3:11-13 God appointed the Levites for this service, because He had decided to adopt them as His own in the place of all the first-born of Egypt. When He slew the first-born of Egypt, He sanctified to Himself all the first-born of Israel, of man and beast, for His own possession (see Exo 13:1-2).
Commenting on Numbers 3:11-13