ציטירנדיקער פּירוש אויף מלכים ב 5:6

I will heal the limping one Heb. אֹסְפָה. I will gather in the exiles. So did Jonathan render. To me, however, it appears as an expression of healing, as in (II Kings 5:6) “And you shall cure him (וְאֲסַפְתּוֹ) of his zaraath.”

ואחר תאסף AND AFTER THAT LET HE BE GATHERED IN AGAIN — I say that all the different forms of the root אסף which are employed in reference to lepers (cf. e. g. 2 Kings 5:6, 11) are used because he (the leper) is sent forth from the camp and when he becomes healed he is taken again into the camp; — on this account it uses of him the term אסיפה, which has the meaning of “taking in” something that was outside.