Numbers 18:4
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 1:51
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 stranger who comes near shall be put to death.
Numbers 3:10
You shall appoint Aaron and his sons, and they shall keep their priesthood. The stranger who comes near shall be put to death."
1 Samuel 6:19
He struck of the men of Beth Shemesh, because they had looked into the ark of Yahweh, he struck of the people fifty thousand seventy men; and the people mourned, because Yahweh had struck the people with a great slaughter.
2 Samuel 6:6-7
When they came to the threshing floor of Nacon, Uzzah put forth [his hand] to the ark of God, and took hold of it; for the cattle stumbled.