פירוש על מלכים ב 5:6

Saying, “Now when this letter reaches, etc.” The letter said to him, “And now, when this letter reaches, etc.”

Arrange to cure him of this tzora’as. ‘אֲסֵפָה’ [=gathering], pertaining to a metzora, is an expression of his cure, because when he is cured, he is [once again] gathered in among people, but during his illness, everyone stays away from him.⁴The Torah forbids a metzora to dwell within the camp of Yisroel. See Vayikra 13:46. However, even among the other nations a metzora is excluded from the general community until he is cured.