Related for Eruvin 74:8
איידי דתני רישא תעלה תנא סיפא נמי תעלה
Raba asked R'Nahman: Who is that Tanna who does not uphold the rule of bererah even in the case of a Rabbinical enactment? For It was taught: 'If a man said to five persons, "Behold I am preparing an 'erub for one of you whom I may choose<span class="x" onmousemove="('comment',' Lit., 'that I shall desire.');"><sup>23</sup></span> [in due course] so that if I wish it he would be allowed to go<span class="x" onmousemove="('comment',' The prescribed Sabbath limit from the place of the 'erub.');"><sup>24</sup></span> and if I would not wish it he would not go", the 'erub is effective if he made up his mind<span class="x" onmousemove="('comment',' Lit., 'if he wished'.');"><sup>25</sup></span>
Tosefta Demai
[If] an am ha'aretz who said to a chaver, "Buy me a bunch of vegetables," [or] "[Buy me] a loaf of bread," Rabbi Yosei says, there is no need [for the chaver] to tithe [what he purchased for the am ha'aretz, see Dem. 6:12]. Rabbi Yehudah says, he needs to tithe. Rabbi Shimon ben Gamaliel says, if he exchanges the money (i.e., he uses his own money rather than the am ha'aretz's money to purchase the vegetables or the bread, see Minchat Yitzchak here), he needs to tithe.
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