2 Peter 2:4-5

For God, indeed, did not spare the angels who sinned, but with chains of darkness confining them in Tartarus, delivered them over to be kept for judgment;

Revelation 3:7

And by the messenger of the congregation in Philadelphia, write: These things says the Holy One, the True One; who has the key, the Son of David; he who opens and no man shuts; and shuts, and no man opens:

Revelation 4:8

And the four living creatures had, each of them, six wings round about; and within they were full of eyes: and they rest not, day or night, saying, Holy, holy, holy, Lord God Almighty, who wast, and art, and art to come.

Treasury of Scripture Knowledge

Summary

Then should I yet have comfort; yea, I would harden myself in sorrow: let him not spare; for I have not concealed the words of the Holy One.

Let him not

Bible References

Let him not

2 Peter 2:4
For God, indeed, did not spare the angels who sinned, but with chains of darkness confining them in Tartarus, delivered them over to be kept for judgment;

The holy one

Revelation 3:7
And by the messenger of the congregation in Philadelphia, write: These things says the Holy One, the True One; who has the key, the Son of David; he who opens and no man shuts; and shuts, and no man opens:
Revelation 4:8
And the four living creatures had, each of them, six wings round about; and within they were full of eyes: and they rest not, day or night, saying, Holy, holy, holy, Lord God Almighty, who wast, and art, and art to come.