Rabbi Yehoshua ben Levi said: “Torah” is written five times regarding a leper. “This is the law [torat] of the mark of leprosy” (Leviticus 13:59). “This shall be the law [torat] of the leper” (Leviticus 14:2). “This is the law [torat] of one in whom there is a mark of leprosy” (Leviticus 14:32). “This is the law [tora] for any leprous mark” (Leviticus 14:54). “This is the law [torat] of leprosy” (Leviticus 14:57). “This shall be the law [torat] of the leper [hametzora],” of the defamer [hamotzi shem ra], to teach you that anyone who speaks slander violates the five books of the Torah. That is why Moses cautions: “This shall be the law of the leper.”
Levi — Moses and the Torah
Vayikra Rabbah 16:6