TSK
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"Bring Aaron your brother, and his sons with him, near to you from among the children of Israel, that he may minister to me in the priest's office, even Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.
and he spoke to Korah and to all his company, saying, "In the morning Yahweh will show who are his, and who is holy, and will cause him to come near to him: even him whom he shall choose he will cause to come near to him.
It shall happen, that the rod of the man whom I shall choose shall bud: and I will make to cease from me the murmurings of the children of Israel, which they murmur against you."
At that time Yahweh set apart the tribe of Levi, to bear the ark of the covenant of Yahweh, to stand before Yahweh to minister to him, and to bless in his name, to this day.