Commentary for Avodah Zarah 94:17
אלא כי אתמר דרבי אמי לענין ביטול אתמר ואע"ג דסייד וכייד בגופה של אבן כי נטל מה שחידש שפיר דמי
Rather R. Ami was referring to annulment, and although he plastered and tiled in the stone itself, if he removes the renovation, it is all right.
Daf Shevui to Avodah Zarah
Ami was not referring to the forming of the stone but to its annulment. What he said was that even if the person had put the plaster or tile in the stone, if he removes it the stone goes back to being permitted (it is annulled). We might have thought that since the plaster was in the stone, it was like making the stone for idolatrous purposes, so R. Ami teaches us that it is not.
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