'Mirror' in the Bible

For now we see in a mirror, darkly; but then face to face: now I know in part; but then shall I know fully even as also I was fully known.

But we all, with unveiled face beholding as in a mirror the glory of the Lord, are transformed into the same image from glory to glory, even as from the Lord the Spirit.

For if any one is a hearer of the word and not a doer, he is like unto a man beholding his natural face in a mirror: