Proverbs 27:17
Iron sharpeneth iron; so a man sharpeneth the countenance of his friend.
More from Proverbs 27
Verse 1
Boast not thyself of to morrow; for thou knowest not what a day may bring forth.
Verse 2
Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Verse 3
A stone is heavy, and the sand weighty; but a fool's wrath is heavier than them both.
Verse 4
Wrath is cruel, and anger is outrageous; but who is able to stand before envy?
Verse 5
Open rebuke is better than secret love.