Commentary for Kiddushin 108:11
לא לעולם ר"מ והכא במאי עסקינן כגון דיהיב ניהליה בטיבליה וקסבר מתנות שלא הורמו כמי שלא הורמו דמיין
Whose [view] is this? Shall we say: R'Meir's? Can one give it as a gift: surely he maintains that [second-] tithe is sacred property?
Daf Shevui to Kiddushin
The gift given to the one separating tithes was not second tithe itself, but untithed produce. The agricultural gifts are still within the produce (mixed up in it) and are not considered as if they have been separated. Therefore, one can give, in a sense, second tithe, to another person. When he separates the tithe, it will be his own tithe he is separating.
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