What are a "Kushi" and a "Namer"?
Rashi: They are a negro and a leopard, respectively.
Radak citing Targum Yonasan: Kushi is an Indian.
What are "Chavarburosav"?
Rashi: They are its spots. They cannot be changed.
Radak: Its checkered armor.
What is the comparison to changing a Kushi's skin [color] or a leopard's spots?
Radak: These are natural; they are not chance. They never go away. So evil does not depart from you, as if it is natural for you. You trained and accustomed yourselves to do evil, until it became natural for you.
Malbim: Even if you will say that a Kushi's skin is black because he lives in Africa, where the sun burns, and if he would go to a cold land, his skin would change, a leopard cannot change its spots. This is the nature of the entire species. Also you cannot improve your way, for it became nature for you.
What is "Limudei"?
Radak: It is like Lamud; a habit.
What is "Hare'a"?
Rashi: It is like Lehara (to do evil). Radak - it is Makor (like an infinitive), like "Hare'a Tare'u" (Shmuel I, 12:25).
