Hebrews 10:19-20

Since then, brothers, we have free access to the sanctuary through the blood of Jesus,

Revelation 11:19

Then the temple of God in heaven was thrown open, and the chest containing his agreement was seen inside the temple, and there were flashes of lightning, rumblings, peals of thunder, an earthquake, and a great storm of hail.

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

Hebrews 10:19
Since then, brothers, we have free access to the sanctuary through the blood of Jesus,
Revelation 11:19
Then the temple of God in heaven was thrown open, and the chest containing his agreement was seen inside the temple, and there were flashes of lightning, rumblings, peals of thunder, an earthquake, and a great storm of hail.