Reference for Bava Kamma 197:9
ולמאי דסליק אדעתין מעיקרא דלא אגריה לביטשי מסייע ליה לרב ששת דבעו מיניה מרב ששת קבלנות עובר עליו משום בל תלין או אינו עובר ואמר להו רב ששת עובר
But be it as it may, since he gave it to him for the purpose of making it softer, as soon as he made it softer was there not already an improvement? — No; the ruling is necessary [for meeting the case] where he hired him to stamp upon it [and undertook to pay him] for every act of stamping one <i>ma'ah</i>,<span class="x" onmousemove="('comment',' v. Glos. ');"><sup>17</sup></span> which is but the hire [for labour].
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