'Watcher' in the Bible

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

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