4 They shall be joined to you, and keep the responsibility of the Tent of Meeting, for all the service of the Tent: and a stranger shall not come near to you.
Numbers 18:4 Cross References - NHEB
Numbers 1:51
51 When the tabernacle is to move, the Levites shall take it down; and when the tabernacle is to be set up, the Levites shall set it up. The unauthorized person who comes near shall be put to death.
Numbers 3:10
10 And you shall appoint Aaron and his sons, and they shall attend to their priesthood; but the unauthorized person who comes near shall be put to death."
1 Samuel 6:19
19 But the sons of Jeconiah did not rejoice with the people of Beth Shemesh when they saw the ark of the LORD. So he struck seventy men of them, and the people mourned, because the LORD had struck the people with a great slaughter.