Bava Batra 9B

״משגש ארחתיה דאימיה״, משמיה דרבי אלעזר ⁠– מאי דכתיב: ״וילבש צדקה כשרין״? לומר לך: מה שריון זה ⁠– כל קליפה וקליפה מצטרפת לשריון גדול, אף צדקה ⁠– כל פרוטה ופרוטה מצטרפת לחשבון גדול. רבי חנינא אמר מהכא: ״וכבגד עדים כל צדקתינו״; מה בגד זה ⁠– כל נימא ונימא מצטרפת לבגד גדול, אף צדקה ⁠– כל פרוטה ופרוטה מצטרפת לחשבון גדול.

who perverted the ways of his mother. He said in the name of R' Elazar: What is the meaning of that which is written: “And He donned charity like a coat of mail” (Isaiah 59:17)? This verse serves to tell you that just as with regard to this coat of mail, each and every scale of which it is fashioned combines to form one large coat of mail, so too with regard to charity, each and every peruta that one gives combines to form a great sum. R' Ḥanina says: The same idea is derived from here, as it is stated: “And all our charity is as a polluted garment” (Isaiah 64:5). Just as with regard to this garment, each and every thread in it combines to form one large garment, so too with regard to charity, each and every peruta combines to form a great sum.

אמאי קרו ליה ״עולא משגש ארחתיה דאימיה״? דבעא מיניה רב אחדבוי בר אמי מרב ששת: מנין למצורע בימי ספורו, שמטמא אדם? אמר לו: הואיל ומטמא בגדים, מטמא אדם.

The Talmud comments: Why was this Sage called the infant who perverted the ways of his mother? It was because of the following incident: Rav Aḥadvoi bar Ami asked Rav Sheshet: From where is it derived that a metzora renders a person impure through contact during his days of counting, i.e., during the 7 days that the metzora must count from the start of his purification process, when he brings his birds, until he completes that process with the bringing of his sacrifices? Rav Sheshet said to him: Since he renders his garments impure, as it states that on the 7th day of his purification he must wash his clothes (see Leviticus 14:9), he also renders people impure.