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.

Exodus 19:21
and the LORD said to him, "Go down and warn the people not to break through to see the LORD, lest many of them perish.

Numbers 4:5
Whenever the camp sets out, Aaron and his sons are to go in, take down the veil of the curtain, and cover the ark of the Testimony with it.

Numbers 4:15
When Aaron and his sons have finished covering the holy objects and all their equipment, as soon as the camp is ready to move, the Kohathites shall come and do the carrying. But they must not touch the holy objects, or they will die. These are the transportation duties of the Kohathites regarding the Tent of Meeting.

Numbers 4:20
But the Kohathites are not to go in and look at the holy objects, even for a moment, or they will die."

2 Samuel 6:7
And the anger of the LORD burned against Uzzah, and God struck him down on the spot for his irreverence, and he died there beside the ark of God.

And he smote the men of Bethshemesh, because they had looked into the ark of the LORD, even he smote of the people fifty thousand and three score and ten men: and the people lamented, because the LORD had smitten many of the people with a great slaughter.