מַצְרֵ֣ף לַ֭כֶּסֶף וְכ֣וּר לַזָּהָ֑ב וּבֹחֵ֖ן לִבּ֣וֹת יְהוָֽה׃
The refining pot is for silver, and the furnace for gold; But the LORD trieth the hearts. .
Read halakhic rulings (Jewish law) on Proverbs 17:3 from the Mishneh Torah and classical halakhic sources, free online.