Reference for Bava Metzia 135:12

אין מושיבין תרנגולין למחצה ואין שמין עגלין וסייחין למחצה אלא אם כן נותן לו שכר עמלו ומזונו

Mar, the son of Amemar, said to R. Ashi: My father does so, but when they [his agents] come before him [and declare that they have earned no profit], he believes them. He replied: That is well whilst he is alive: but what if he dies and the notes are transferred to his heirs?<span class="x" onmousemove="('comment',' They would simply see the debt, and might not believe the agents. ');">¹⁰</span>

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