Numbers 18:4

And they shall be joined to you, and shall keep the charges of the tabernacle of witness, in all the services of the tabernacle; and a stranger shall not approach to you.

And they shall be joined unto thee, and keep the charge of the tabernacle of the congregation, for all the service of the tabernacle: and a stranger shall not come nigh unto you.

They shall be joined to you and keep the responsibility of the Tent of Meeting, for all the service of the Tent. A stranger shall not come near to you.