Reference for Nedarim 71:9

אלא מעתה יביא אדם פסח על חבירו שכן אדם מביא על בניו ועל בנותיו הקטנים אלמה אמר רבי אלעזר הפריש פסח על חבירו לא עשה כלום

Now, it is well if you say that they are the agents of the All-Merciful: hence their piggul stands. But if you say that they are our agents, why is it so; let him say to him, 'I appointed you an agent for my advantage, not for my hurt'?<span class="x" onmousemove="('comment',' I.e., such an act committed on behalf of someone else can be repudiated. ');">⁹</span>

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