Numbers 3:10

But you shall appoint Aaron and his sons over the service of the priesthood. The outsider who approaches to minister shall be put to death.

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And thou shalt appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that cometh nigh shall be put to death.

And you shall appoint Aaron and his sons, and they shall guard their priesthood. But if any outsider comes near, he shall be put to death."

Appoint Aaron and his sons to serve as priests; anyone else who approaches the sanctuary must be put to death."