Related for Ketubot 196:6
אי אמרת בשלמא מוסיף על דבריו הוי משום הכי בעל הבית מעל אלא אי אמרת מעביר על דבריו הוי בעל הבית אמאי מעל והתנן השליח שעשה שליחותו בעל הבית מעל לא עשה שליחותו שליח מעל
Now this makes sense if you say [that the agent] was merely adding to the host's instructions, this is why the householder is guilty of trespass. But if you say, [that the agent] was transgressing his instruction: Why should the householder be guilty of trespass? Have we not in fact learned: If an agent performed his mission the householder is guilty of trespass but if he did not perform his mission the agent is guilty of trespass?
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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