כא אמר לו
21 Actually there is no presumption at all that an agent carries out his instructions; now in the case of shechitah, even if we take into account the possibility that a stranger, having overheard the instructions, went and slaughtered [the animal], there is no harm, because of the principle that 'the majority of those who slaughter are qualified'; whereas in the case of terumah if we take into account the possibility that a stranger having overheard the instructions, went and set aside the terumah [it would be invalid] for he would have done so without the consent of the owner, and [the law is that] if one sets aside terumah without the consent of the owner the terumah is not valid.<span class="x" onmousemove="('comment',' V. Ter. I, 1, and Git 23b.');"><sup>9</sup></span>