Reference for Bekhorot 72:2

סיפא ודאי מסייעא ליה

he can excuse himself by some subterfuge, [saying, 'As far as I am concerned, his word is taken'].<span class="x" onmousemove="('comment',' That although the seller may not be trustworthy in the sender's opinion, he is regarded as trustworthy by his agent. Therefore the agent has no fear of being found out. The bracketed words are inserted from Sh. Mek.');">²</span>

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