And that they should attend to the needs of the tabernacle of meeting, and the needs of the holy place, and the needs of the sons of Aaron their brethren, in the service of the house of the LORD.
Therefore you and your sons with you shall keep your priest's office for everything at the altar, and within the veil; and you shall serve: I have given your priest's office unto you as a gift for service: and the stranger that comes near shall be put to death.
But shall minister with their brethren in the tabernacle of meeting, to keep the charge, and shall do no service. Thus shall you do unto the Levites regarding their duties.