Talmud for Moed Katan 52:4
ת"ר תחילת קריעה טפח ותוספת שלש אצבעות דברי רבי מאיר רבי יהודה אומר תחילת קריעה שלש אצבעות ותוספת כל שהו
R'Simeon B'Eleazar forbids complete mending of the rent. And just as the vendor [of the garment] is forbidden to reunite the rent [completely] the buyer too is forbidden to reunite it [completely] and accordingly the vendor is bound to inform the buyer of [the nature of the rent].
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