Numbers 17:12

Enough had been done in the chapter before to quash all pretensions of the families of the tribe of Levi that would set up in competition with Aaron, and to make it appear that Aaron was the head of the tribe; but it seems, when that matter was settled, the princes of the rest of the tribes began to murmur. If the head of a tribe must be a priest, why not the head of some other tribe than that of Levi? He that searches the heart knew this thought to be in the breast of some of them, and before it broke out into any overt act graciously anticipated it, to prevent bloodshed; and it is done by miracle in this chapter, not a miracle of wrath, as before, but of grace. I. The matter is put upon trial by the bringing of twelve rods, one for each prince, before the Lord (Num 17:1-7). II. Upon trial, the matter is determined by the miraculous blossoming of Aaron's rod (Num 17:8, Num 17:9). III. The decision of the controversy is registered by the preservation of the rod (Num 17:10, Num 17:11). IV. The people acquiesce in it with some reluctance (Num 17:12, Num 17:13).

17:12-13 The Lord and his Tabernacle were holy, and because of God’s holiness, his sanctuary could be a dangerous place for those who were not qualified to enter it. Moses’ efforts to make the people understand and respect the God of Israel were bearing fruit.