Parallel
Proverbs 27:17
Swete's Septuagint · Berean Standard Bible
σίδηρος σίδηρον ὀξύνει, ἀνὴρ δὲ παροξύνει πρόσωπον ἑταίρου.
As iron sharpens iron, so one man sharpens another (note: Hebrew sharpens the face of another or sharpens the countenance of a friend).