Teshuvot Maharam, Lemberg Edition
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¹ תשובתמורי ה"ר מאיר על החומץ שנתחמץ בשמרי שכר שיש למוכרו לעכו"ם קודם הפסח ולומר לו אם תשמרהו עד לאחר הפסח אקניהו ממך או אני או יהודי אחר:
footnotes: ¹ ארוכות סי' ל"א קצרות סי' ס"ח שו"ת הרשב"א ח"א סי' תת"ן.
Rabbi Meir of Rothenburg, his life and his works, by Irving A. Agus. Philadelphia, 1947
Vinegar that has been mixed with the yeast of beer must be sold to a Gentile before Passover (in order not to violate the commandment of Ex. 12,19 and 13,7, which prohibits a Jew from possessing leaven during the Passover week). The Gentile may be told that if he holds the vinegar until after Passover, a Jew will buy it from him. SOURCES: Cr. 68; Pr. 31; L. 340; Rashba I, 850.