Reference for Avodah Zarah 66:3
אמר רב אשי לא תימא עד דנתרן אלא אפי' רפאי מירפא אע"ג דלא נתר קינסא פליגי בה רב אחא ורבינא חד אסר וחד שרי והלכתא כמאן דאסר
R. Ashi said: Do not say “until it has fallen off,” rather, even if it has only been loosened, even though it has not dropped off [it is enough]. [Where the pitch is removed by means of lighted wood chips: R. Aha and Ravina dispute this: One forbids while the other permits. The law follows the one who forbids.
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