Reference for Bekhorot 73:39

יין נסך שנפל לבור כולו אסור בהנאה רבן שמעון בן גמליאל אומר

[one can explain that he sold it to him] mixed [with permitted wine], [and had he not consumed it he would have been able to benefit by it] according to the ruling of R'Simeon B'Gamaliel.

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