Teshuvot Maharam, Lemberg Edition
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למזוגיין נסך לגוים אסור ואם מיחו בידם ולא קיבלו מוטב שיהו שוגגים ואל יהיו מזידין וכמה פעמים תמהתי איך פשט ההיתר אבל יין שלנו מותר למזוג להם:
A Jew is not permitted to offer a Gentile forbidden wine (yayin nesek — wine touched by a Gentile). I often wondered how this custom, to offer forbidden wine to Gentiles, became so widely accepted. If the perpetrators had been duly warned against this practice and did not heed the warning, they need no longer be disturbed; for it is better that they transgress innocently than rebelliously. Our own wine, of course, we are permitted to offer to a Gentile (although this wine becomes yayin nesek as soon as the Gentile touches it). SOURCES: L. 145.