Reference for Bava Kamma 191:5

בעי רבא השביח לוקח מהו בתר דבעיא הדר פשטה מה מכר ראשון לשני כל זכות שתבא לידו:

Raba [again] asked: What would be the law where a heathen<span class="x" onmousemove="('comment',' Who neither respects nor feels bound by Rabbinic enactments. ');">⁸</span> [misappropriated an article and] improved it? — Said R. Aha of Difti to Rabina: Shall we trouble ourselves to make an enactment<span class="x" onmousemove="('comment',' That according to R. Simeon payment is to be made for amelioration to the extent of a half or third or quarter. ');">⁹</span>

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