'Mirror' in the Bible

can you help God spread out the skiesas hard as a cast metal mirror?

For now we see indistinctly, as in a mirror,but then face to face.Now I know in part,but then I will know fully,as I am fully known.

and we all, with unvailed face, the glory of the Lord beholding in a mirror, to the same image are being transformed, from glory to glory, even as by the Spirit of the Lord.

Because if anyone is a hearer of the word and not a doer, he is like a man looking at his own face in a mirror.