Numbers 12:14

ואביה ירק ירק בפניה IF HER FATHER HAD BUT SPIT IN HER FACE — i.e. if he had shown her an angry face (if he was offended with her), הלא תכלם שבעת ימים SHOULD SHE NOT BE PUT TO SHAME FOR SEVEN DAYS? — It follows therefore à fortiori with respect to the Shechinah (i.e. in the case where God rebukes her in such a stern way) that she ought to be put to shame for fourteen days!) But since there is a rule דין לבא מן הדין להיות כנדון “It is sufficient for a law that is derived by a conclusion a fortiori (הבא מן הדין) to be only as strict as the law from which it is derived (נדון), and not go beyond it, therefore even as a consequence of My reprimand, תסגר שבעת ימים LET HER BE SHUT OUT [FROM THE CAMP] SEVEN DAYS only (Sifrei Bamidbar 106; Bava Kamma 25a). 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.

וַיֹּ֨אמֶר יְהֹוָ֜ה אֶל־מֹשֶׁ֗ה וְאָבִ֙יהָ֙ יָרֹ֤ק יָרַק֙ בְּפָנֶ֔יהָ הֲלֹ֥א תִכָּלֵ֖ם שִׁבְעַ֣ת יָמִ֑ים תִּסָּגֵ֞ר שִׁבְעַ֤ת יָמִים֙ מִח֣וּץ לַֽמַּחֲנֶ֔ה וְאַחַ֖ר תֵּאָסֵֽף׃

And the Lord said to Moshe, If her father had but spit in her face, should she not be ashamed for seven days? let her be shut out from the camp seven days, and after that let her be received in again.