Reference for Menachot 139:4

תפשוט ליה מהא דאמר רבי יצחק אמר ר' יוחנן ליטרא בצל שתיקנו וזרעו מתעשר לפי כולו

R. Tabyom b. Kisna said in the name of Samuel, If a man sowed diverse seeds in an unperforated plant-pot, it is forbidden. Said Abaye, It is well if he were to teach us that the man suffers the Rabbinic penalty of chastisement; but what does he teach us by saying 'It is forbidden'? That Rabbinically it is regarded as a sowing? Surely this we have already learnt: If a man set aside as terumah that which grew in an unperforated pot for that which grew in a perforated pot, [what has been set aside is accounted as] terumah, yet he must give the terumah afresh. <br>

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