Related for Ketubot 196:9
מאי לאו דזבין שוה מנה ודינר במנה ודינר ומאי במנה מנה שלה ומאי אפי' אפי' היא אומרת אחזיר את הדינר ליורשים בדינר מקרקעי וקתני מכרה בטל
Does not [this mean] that she sold [land that was] worth a maneh and a denar for a maneh, and what does it mean “for a maneh” the maneh that was due to her, and by even, it means even though she said, I will return the denar to the heirs [by repurchasing for them] land of the value of a denar’? And was it not nevertheless stated, her sale is void?
Tosefta Demai
[If] five said to one, "Go and bring us ten loaves of bread" [or] "[Go and bring us] ten bunches of vegetables," [and] he brings each one to his face (i.e., he brings that person what was purchased with that person's money), [then the] chaverim that are among them (i.e., among the purchasers) do not need to tithe except for their own portions. [But if] he brings them mixed together [so that he cannot tell which produce was purchased with which money], [then] the chaverim that are among them need to tithe on everything. If they gave him one in addition (i.e., the seller delivered one more item than was ordered, e.g., a baker's dozen), Rabbi Yehudah says, "It belongs to the messenger," and Rabbi Yosei says, "It is in the middle," (i.e., they all divide it, see Y. Dem. VI.8.6 ["רִבִּי יוֹסֵי אוֹמֵר שֶׁל שְׁנֵיהֶן"]).
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