וְיָצָא הַּכֹהֵן אֶ ל מִ חּוץ לַּמַ חֲנֶה וגו' וְהִ ּנֵה נִרְ ּפָא נֶגַע הַּצָרַ עַת מִ ן הַּצָרּועַ (יד, ג)
And the kohen goes out to outside the camp… And, behold, the nega of tzora’as has healed from the afflicted person. (14:3)
Sefer Agra D’Kallah asks why the word “behold”, which sounds as if the nega was healed suddenly, is used in this verse. Why doesn’t it simply say, “And the negas has healed.” Secondly, he asks why it says that the tzora’as was healed “from the afflicted person.” Those words seem unnecessary.
He answers that the verse is saying that the kohen sees that the affliction and its cure is not a natural one. Rather, in one second, the nega suddenly is removed from the afflicted person right in front of his eyes. This proves that it was sent by Hashem as an act of hashgacha pratis, and not as a natural disease.