Proverbs 28:11 Halakhah

חָכָ֣ם בְּ֭עֵינָיו אִ֣ישׁ עָשִׁ֑יר וְדַ֖ל מֵבִ֣ין יַחְקְרֶֽנּוּ׃

The rich man is wise in his own eyes; But the poor that hath understanding searcheth him through.

Read halakhic rulings (Jewish law) on Proverbs 28:11: and classical halakhic sources.