Where does the Bible say “iron sharpens iron”?
It is in Proverbs 27:17 · King James Version
“Iron sharpeneth iron; so a man sharpeneth the countenance of his friend.”Read the chapter Proverbs 27 →
See also
Ecclesiastes 4:9
Two are better than one; because they have a good reward for their labour.
Ecclesiastes 4:10
For if they fall, the one will lift up his fellow: but woe to him that is alone when he falleth; for he hath not another to help him up.