רִֽ֭יבְךָ רִ֣יב אֶת־רֵעֶ֑ךָ וְס֖וֹד אַחֵ֣ר אַל־תְּגָֽל׃
Trata tu causa con tu compañero Y no descubras el secreto á otro.
Rashi on Proverbs
Have your quarrel with your friend But if, perforce, you must quarrel and debate with your friend, in any event, do not divulge another’s secret Do not mention to him the disgrace of his ancestors, which not everyone knows, and you are revealing it.