'Watcher' in the Bible

If I have sinned, what do I unto thee, O thou watcher of men? Why hast thou set me as a mark for thee, So that I am a burden to myself?

I saw in the visions of my head upon my bed, and, behold, a watcher and a holy one came down from heaven.

And whereas the king saw a watcher and a holy one coming down from heaven, and saying, Hew down the tree, and destroy it; nevertheless leave the stump of the roots thereof in the earth, even with a band of iron and brass, in the tender grass of the field, and let it be wet with the dew of heaven: and let his portion be with the beasts of the field, till seven times pass over him;