Hebrews 10:19-20

Having therefore, brethren, free liberty to enter into the holiest by the blood of Jesus,

Revelation 11:19

And the temple of God was opened in heaven, and the ark of the covenant was seen in the temple, and there were lightnings, and voices, and thunders, and an earthquake, and great 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
Having therefore, brethren, free liberty to enter into the holiest by the blood of Jesus,
Revelation 11:19
And the temple of God was opened in heaven, and the ark of the covenant was seen in the temple, and there were lightnings, and voices, and thunders, and an earthquake, and great hail.