Related for Bekhorot 121:40
פיחת עשרה או הוסיף עשרה תרומתו תרומה
He [the owner] can therefore say to him [the agent]: 'You should not have made a mistake'.<span class="x" onmousemove="('comment',' You should have marked the certain tenth as the tenth. R. Papa therefore maintains that in every case the agency is void and thus the animal is not sacred. ');"><sup>28</sup></span>
Tosefta Terumot
[If an owner] says to his agent, "Go and separate terumah!", he separates an average amount, one fiftieth. [If the owner says] "Go and separate terumah, one fiftieth!" and [the agent inadvertently] reduces it by ten [parts] or increases it by ten [parts], his terumah is [valid] terumah, but if he intended to add [even] one [part more], his terumah is not [valid] terumah. (Ter. 4:4.)
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