Reference for Ketubot 51:8

פשיטא מהו דתימא מדהנך לאכילה האי נמי לאכילה קמ"ל הנך לאכילה האי לזבוני:

This is obvious! What might you have said? Since these [get their share of terumah] in order to eat it, so too this one also [gets his share of terumah] in order to eat it. So he teaches us [that] those [get the terumah] for eating and this one for selling.

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