Revelation 1:18

I am he who lives and was dead; and behold, I am living for ever and ever; and I have the keys of the unseen world, and of death.

Revelation 2:23

and I will say her children with death; and all the congregations shall know that I am he who search the reins and the heart; and I will give to every one of you according to your works.

Treasury of Scripture Knowledge

Summary

Hell and destruction are before the LORD: how much more then the hearts of the children of men?

The hearts

Bible References

Hell

Revelation 1:18
I am he who lives and was dead; and behold, I am living for ever and ever; and I have the keys of the unseen world, and of death.

The hearts

Revelation 2:23
and I will say her children with death; and all the congregations shall know that I am he who search the reins and the heart; and I will give to every one of you according to your works.