Related for Bekhorot 121:32
צא ועשר עלי רב פפי משמיה דרבא אמר
But R'Papa in the name of Raba Says: Even if he called the ninth the tenth, it is not sacred, for he [the sender] c say to him: 'I sent you to do the right thing<span class="x" onmousemove="('comment',' To benefit me.');"><sup>21</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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