Numbers 4:20

but they shall not go in to see the holy objects even for a moment, 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 to the Lord to gaze, and many of them perish.

1 Samuel 6:19

He struck down some of the men of Beth-shemesh because they had looked into the ark of the Lord. He struck down of all the people, 50,070 men, 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 consumed them, and they died before the Lord.

Numbers 4:15

When Aaron and his sons have finished covering the holy objects and all the furnishings of the sanctuary, when the camp is to set out, after that the sons of Kohath shall come to carry them, so that they will not touch the holy objects and die. These are the things in the tent of meeting which the sons of Kohath are to carry.

Numbers 4:19

But do this to them that they may live and not die when they approach the most holy objects: Aaron and his sons shall go in and assign each of them to his work and to his load;

Hebrews 10:19-20

Therefore, brethren, since we have confidence to enter the holy place by the blood of Jesus,

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 and sounds and peals of thunder and an earthquake and a great hailstorm.

Treasury of Scripture Knowledge

Summary

But they shall not go in to see when the holy things are covered, lest they die.

Bible References

They shall

Numbers 4:15
When Aaron and his sons have finished covering the holy objects and all the furnishings of the sanctuary, when the camp is to set out, after that the sons of Kohath shall come to carry them, so that they will not touch the holy objects and die. These are the things in the tent of meeting which the sons of Kohath are to carry.
Exodus 19:21
Then the Lord spoke to Moses, “Go down, warn the people, so that they do not break through to the Lord to gaze, and many of them perish.
Leviticus 10:2
And fire came out from the presence of the Lord and consumed them, and they died before the Lord.
1 Samuel 6:19
He struck down some of the men of Beth-shemesh because they had looked into the ark of the Lord. He struck down of all the people, 50,070 men, and the people mourned because the Lord had struck the people with a great slaughter.
Hebrews 10:19
Therefore, brethren, since we have confidence to enter the holy place by the blood of Jesus,
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 and sounds and peals of thunder and an earthquake and a great hailstorm.