Discovery BoxNumbers 8:19 
Context8:19 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.” 1
Numbers 16:46
Context16:46 Then Moses said to Aaron, “Take the censer, put burning coals from the altar in it, place incense on it, and go quickly into the assembly and make atonement for them, for wrath has gone out from the Lord – the plague has begun!”
Numbers 25:18
Context25:18 because they bring trouble to you by their treachery with which they have deceived 2 you in the matter of Peor, and in the matter of Cozbi, the daughter of a prince of Midian, 3 their sister, who was killed on the day of the plague that happened as a result of Peor.”
1 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.
2 tn This is the same word as that translated “treachery.”
3 sn Cozbi’s father, Zur, was one of five Midianite kings who eventually succumbed to Israel (Num 31:8). When the text gives the name and family of a woman, it is asserting that she is important, at least for social reasons, among her people.
