הֲיַהֲפֹ֤ךְ כּוּשִׁי֙ עוֹר֔וֹ וְנָמֵ֖ר חֲבַרְבֻּרֹתָ֑יו גַּם־אַתֶּם֙ תּוּכְל֣וּ לְהֵיטִ֔יב לִמֻּדֵ֖י הָרֵֽעַ׃
Can the Ethiopian change his skin, Or the leopard his spots? Then may ye also do good, That are accustomed to do evil.
Rashi on Jeremiah
a Cushite Heb. כושי, the name of a black man, who is called Maure in French, a Moor.
Rashi on Jeremiah
his spots The leopard is spotted, and they are the spots (taches in French), and it is impossible for them to change.