Reference for Bava Metzia 160:9

אלא אפילו תימא ר' מאיר בההיא הנאה דקא יהיב ליה טפי פורתא הוי עילויה שומר שכר

Raba said: You may even say that it did not strike him down immediately, but this is taught only with regard to extra pay.<span class="x" onmousemove="('comment',' If the load exceeds the weight agreed upon by a kab, he is entitled to additional remuneration. ');">⁹</span>

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