Numbers 4:20
But the Kohathites shall not go in to see the holy things, even for an instant, or they will die.”
Exodus 19:21
Then the Lord spoke to Moses, “Go down, warn the people, so that they do not break through [the barriers around the mountain] to the Lord to see [Me], and many of them perish [as a result].
1 Samuel 6:19
The Lord struck down some of the men of Beth-shemesh because they had looked into the ark of the Lord. He struck down 50,070 men among the people, and the people mourned because the Lord had struck the people with a great slaughter.
Leviticus 10:2
And fire came out from the presence of the Lord and devoured them, and they died before the Lord.
Numbers 4:15
When Aaron and his sons have finished covering the sanctuary and all its furniture, as the camp sets out, after all that [is done, but not before], the sons of Kohath shall come to carry them [using the poles], so that they do not touch the holy things, and die. These are the things in the Tent of Meeting (tabernacle) which the sons of Kohath are to carry.
Numbers 4:19
But deal with them in this way, so that they may live and not die when they approach the most holy things: Aaron and his sons shall go in and assign each of them to his [specific] work and to his load [to be carried on the march].
Hebrews 10:19-20
Therefore,
Revelation 11:19
And the temple of God which is in heaven was opened; and the ark of His covenant appeared in His temple, and there were flashes of lightning, loud rumblings and peals of thunder and an earthquake and a great hailstorm.