Deuteronomy 18:5
For in him Jehovah thy God chose from all thy tribes to stand to serve in the name of Jehovah, he and his sons all the days.
Deuteronomy 10:8
In that time Jehovah separated the tribe of Levi, to lift up the ark of the covenant of Jehovah, to stand before Jehovah to serve him, and to praise in his name, even to this day.
Deuteronomy 17:12
And the man which shall do in pride not to hear to the priest, he standing to serve there Jehovah thy God, or to the judge, and that man shall die: and put thou away evil from Israel
Exodus 28:1-14
And thou, bring thou Aaron thy brother, and his sons with him, from the midst of the sons of Israel, for him to be a priest to me, Aaron, Nadab, Abihu, Eleazar, and Ithamar, sons of Aaron.
Numbers 3:10
And Aaron and his sons thou shalt set up, and they shall watch their priesthood; and the stranger coming near shall die.
Numbers 16:5
And he will speak to Korah and to all his assembly, saying, The morning Jehovah will make known who is to him, and the holy; and bring near to him: and whom he will choose for him he will bring near to himself.
Numbers 16:9-10
Is this small for you that the God of Israel separated you from the assembly of Israel to bring you near to him to serve the services of the dwelling of Jehovah, and to stand before the assembly to serve them?
Numbers 17:5-9
And it was the man whom I shall desire him, his rod shall be fruitful: and I caused to cease from me the murmurings of the sons of Israel which they are murmuring against you.
Numbers 25:13
And it shall be to him and to his seed after him, the covenant of the priesthood forever, because he was jealous for his God; and he shall expiate for the sons of Israel.