Numbers 18:4
They are to be joined with you in the care of the Tent of meeting, doing whatever is needed for the Tent: and no one of any other family may come near you.
Numbers 1:51
And when the Tent of meeting goes forward, the Levites are to take it down; and when it is to be put up, they are to do it: any strange person who comes near it is to be put to death.
Numbers 3:10
And give orders that Aaron and his sons are to keep their place as priests; any strange person who comes near is to be put to death.
1 Samuel 6:19
But the Lord sent destruction on seventy men of the people of Beth-shemesh for looking into the ark of the Lord; and great was the sorrow of the people for the destruction which the Lord had sent on them.
2 Samuel 6:6-7
And when they came to Nacon's grain-floor, Uzzah put his hand on the ark of God to keep it safe in its place, for the oxen were out of control.