Bilangan 3:9

3:9 You are to assign ¹  the Levites to Aaron and his sons; they will be assigned exclusively ²  to him out of all ³  the Israelites.

Bilangan 8:19

8:19 I have given the Levites as a gift to Aaron and his sons from among the Israelites, to do the work for the Israelites in the tent of meeting, and to make atonement for the Israelites, so there will be no plague among the Israelites when the Israelites come near the sanctuary.” ⁴ 

[3:9]  ¹ tn The verb וְנָתַתָּה (vÿnatattah) is normally “give.” Here, though, the context refers to the assignment of the Levites to the priests for their duties. The form is the perfect tense with vav (ו) consecutive, continuing the sequence for the imperfect of instruction.

[3:9]  ² tn This emphasis is derived from the simple repetition of the passive participle, נְתוּנִם נְתוּנִם (nÿtunim nÿtunim). See GKC 396 §123.e. The forms serve as the predicate with the subject pronoun.

[3:9]  ³ tn The Hebrew text simply has the preposition, “from the Israelites.”

[8:19]  ⁴ sn The firstborn were those that were essentially redeemed from death in Egypt when the blood was put on the doors. So in the very real sense they belonged to God (Exod 13:2,12). The firstborn was one who stood in special relationship to the father, being the successive offspring. Here, the Levites would stand in for the firstborn in that special role and special relationship. God also made it clear that the nation of Israel was his firstborn son (Exod 4:22-23), and so they stood in that relationship before all the nations. The tribe of Reuben was to have been the firstborn tribe, but in view of the presumptuous attempt to take over the leadership through pagan methods (Gen 35:22; 49:3-4), was passed over. The tribes of Levi and Simeon were also put down for their ancestors’ activities, but sanctuary service was still given to Levi.