(Exodus 38:8; Job 37:18) The Hebrew women on coming out of Egypt probably brought with them mirrors like those which were used by the Egyptians, and were made of a mixed metal, chiefly copper, wrought with admirable skill, and susceptible of a bright lustre. (1 Chronicles 13:12)
Mirror
Mirrors in Paul’s day were polished metal, and the Bible’s word for them is simply “glass”. Paul uses one to describe how little we see now: “For now we see through a glass, darkly; but then face to face.” He uses it again for beholding the Lord’s glory and being changed. James has another picture, a man who glances at his own face, walks away and straightway forgets what he looked like. Hearing the word without doing it is that quick look. Read James 1:22-25 for the whole thought.
4 verses
1 Corinthians
1 Corinthians 13:12
For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known.
2 Corinthians
2 Corinthians 3:18
But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord.
James
James 1:23
For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass:
James 1:24
For he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was.
From Smith's Bible Dictionary
William Smith, 1884