a stranger

Numbers 1:51
Whenever the tabernacle is to move, the Levites are to take it down, and whenever it is to be pitched, the Levites are to set it up. Any outsider who goes near it must be put to death.

Numbers 3:10
So you shall appoint Aaron and his sons to carry out the duties of the priesthood; but any layman who approaches the tabernacle must be put to death."

1 Samuel 6:19
But God struck down some of the people of Beth-shemesh because they looked inside the ark of the LORD. He struck down seventy men, and the people mourned because the LORD had struck them with a great slaughter.

2 Samuel 6:6, 7
When they came to the threshing floor of Nachon, Uzzah reached out and took hold of the ark of God, because the oxen had stumbled. . . .